21013131002221 has 16 divisors (see below), whose sum is σ = 21229474780800. Its totient is φ = 20797227057600.

The previous prime is 21013131002207. The next prime is 21013131002239. The reversal of 21013131002221 is 12220013131012.

It is a cyclic number.

It is not a de Polignac number, because 21013131002221 - 2⁷ = 21013131002093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013131102221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432870211 + ... + 432918751.

It is an arithmetic number, because the mean of its divisors is an integer number (1326842173800).

Almost surely, 2^{21013131002221} is an apocalyptic number.

It is an amenable number.

21013131002221 is a deficient number, since it is larger than the sum of its proper divisors (216343778579).

21013131002221 is a wasteful number, since it uses less digits than its factorization.

21013131002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52980.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21013131002221 its reverse (12220013131012), we get a palindrome (33233144133233).

The spelling of 21013131002221 in words is "twenty-one trillion, thirteen billion, one hundred thirty-one million, two thousand, two hundred twenty-one".