21010131202221 has 48 divisors (see below), whose sum is σ = 34757340578688. Its totient is φ = 11980218038400.

The previous prime is 21010131202201. The next prime is 21010131202241. The reversal of 21010131202221 is 12220213101012.

21010131202221 is a `hidden beast` number, since 210 + 1 + 0 + 1 + 31 + 202 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (21010131202201) and next prime (21010131202241).

It is not a de Polignac number, because 21010131202221 - 2³⁰ = 21009057460397 is a prime.

It is a super-2 number, since 2×21010131202221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21010131202194 and 21010131202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010131202201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56886811 + ... + 57254951.

It is an arithmetic number, because the mean of its divisors is an integer number (724111262056).

Almost surely, 2^{21010131202221} is an apocalyptic number.

21010131202221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21010131202221 is a deficient number, since it is larger than the sum of its proper divisors (13747209376467).

21010131202221 is a wasteful number, since it uses less digits than its factorization.

21010131202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370082 (or 370079 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21010131202221 its reverse (12220213101012), we get a palindrome (33230344303233).

The spelling of 21010131202221 in words is "twenty-one trillion, ten billion, one hundred thirty-one million, two hundred two thousand, two hundred twenty-one".