Base | Representation |
---|---|
bin | 11101011010011000111… |
… | …010111010110100010101 |
3 | 21011020001220210011111021 |
4 | 131122120322322310111 |
5 | 231103404223224341 |
6 | 4144305423041141 |
7 | 266012140220032 |
oct | 35323072726425 |
9 | 7136056704437 |
10 | 2021200211221 |
11 | 70a205910304 |
12 | 28787ba401b1 |
13 | 1187a17a8659 |
14 | 6db8031c389 |
15 | 378992c69d1 |
hex | 1d698ebad15 |
2021200211221 has 4 divisors (see below), whose sum is σ = 2021235895744. Its totient is φ = 2021164526700.
The previous prime is 2021200211213. The next prime is 2021200211263. The reversal of 2021200211221 is 1221120021202.
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 2021200211221 - 23 = 2021200211213 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2021200211195 and 2021200211204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2021200211321) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17757165 + ... + 17870626.
It is an arithmetic number, because the mean of its divisors is an integer number (505308973936).
Almost surely, 22021200211221 is an apocalyptic number.
It is an amenable number.
2021200211221 is a deficient number, since it is larger than the sum of its proper divisors (35684523).
2021200211221 is an equidigital number, since it uses as much as digits as its factorization.
2021200211221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 35684522.
The product of its (nonzero) digits is 64, while the sum is 16.
Adding to 2021200211221 its reverse (1221120021202), we get a palindrome (3242320232423).
The spelling of 2021200211221 in words is "two trillion, twenty-one billion, two hundred million, two hundred eleven thousand, two hundred twenty-one".
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