Base | Representation |
---|---|
bin | 11110110111100010000… |
… | …010100110100110001001 |
3 | 21111210012212010022101122 |
4 | 132313202002212212021 |
5 | 234223220032210441 |
6 | 4302245421525025 |
7 | 306152406535223 |
oct | 36674202464611 |
9 | 7453185108348 |
10 | 2121211210121 |
11 | 748667479003 |
12 | 2a3131413775 |
13 | 12504c669503 |
14 | 7494aa03413 |
15 | 3a29e48534b |
hex | 1ede20a6989 |
2121211210121 has 8 divisors (see below), whose sum is σ = 2127988959240. Its totient is φ = 2114434003968.
The previous prime is 2121211210091. The next prime is 2121211210123. The reversal of 2121211210121 is 1210121121212.
It can be written as a sum of positive squares in 4 ways, for example, as 81638775625 + 2039572434496 = 285725^2 + 1428136^2 .
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 2121211210121 - 222 = 2121207015817 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 2121211210121.
It is not an unprimeable number, because it can be changed into a prime (2121211210123) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8582015 + ... + 8825723.
It is an arithmetic number, because the mean of its divisors is an integer number (265998619905).
Almost surely, 22121211210121 is an apocalyptic number.
It is an amenable number.
2121211210121 is a deficient number, since it is larger than the sum of its proper divisors (6777749119).
2121211210121 is a wasteful number, since it uses less digits than its factorization.
2121211210121 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 271483.
The product of its (nonzero) digits is 32, while the sum is 17.
Adding to 2121211210121 its reverse (1210121121212), we get a palindrome (3331332331333).
It can be divided in two parts, 2121211 and 210121, that added together give a palindrome (2331332).
The spelling of 2121211210121 in words is "two trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-one".
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