Base | Representation |
---|---|
bin | 111111100000100… |
… | …1100100011110101 |
3 | 12111111220000220110 |
4 | 1333001030203311 |
5 | 13331020120041 |
6 | 551243053233 |
7 | 103544241234 |
oct | 17701144365 |
9 | 5444800813 |
10 | 2131020021 |
11 | 9a39a5979 |
12 | 4b5811219 |
13 | 27c65c1c0 |
14 | 163042b1b |
15 | c7143516 |
hex | 7f04c8f5 |
2131020021 has 32 divisors (see below), whose sum is σ = 3170160000. Its totient is φ = 1264290048.
The previous prime is 2131020007. The next prime is 2131020049. The reversal of 2131020021 is 1200201312.
It is not a de Polignac number, because 2131020021 - 27 = 2131019893 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 2131019979 and 2131020006.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2131020061) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1253430 + ... + 1255128.
It is an arithmetic number, because the mean of its divisors is an integer number (99067500).
Almost surely, 22131020021 is an apocalyptic number.
It is an amenable number.
2131020021 is a deficient number, since it is larger than the sum of its proper divisors (1039139979).
2131020021 is a wasteful number, since it uses less digits than its factorization.
2131020021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2853.
The product of its (nonzero) digits is 24, while the sum is 12.
The square root of 2131020021 is about 46162.9724021320. The cubic root of 2131020021 is about 1286.8537031638.
Adding to 2131020021 its reverse (1200201312), we get a palindrome (3331221333).
The spelling of 2131020021 in words is "two billion, one hundred thirty-one million, twenty thousand, twenty-one".
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