21130312202221 has 16 divisors (see below), whose sum is σ = 22187083737600. Its totient is φ = 20095468481088.

The previous prime is 21130312202213. The next prime is 21130312202231. The reversal of 21130312202221 is 12220221303112.

It is a cyclic number.

It is not a de Polignac number, because 21130312202221 - 2³ = 21130312202213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130312202192 and 21130312202201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130312202231) 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, 22682596 + ... + 23595778.

It is an arithmetic number, because the mean of its divisors is an integer number (1386692733600).

Almost surely, 2^{21130312202221} is an apocalyptic number.

It is an amenable number.

21130312202221 is a deficient number, since it is larger than the sum of its proper divisors (1056771535379).

21130312202221 is a wasteful number, since it uses less digits than its factorization.

21130312202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925188.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21130312202221 its reverse (12220221303112), we get a palindrome (33350533505333).

The spelling of 21130312202221 in words is "twenty-one trillion, one hundred thirty billion, three hundred twelve million, two hundred two thousand, two hundred twenty-one".