21213312122010 has 48 divisors (see below), whose sum is σ = 54082935563616. Its totient is φ = 5324125393152.

The previous prime is 21213312121999. The next prime is 21213312122011. The reversal of 21213312122010 is 1022121331212.

It is a super-2 number, since 2×21213312122010² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213312122011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1223365732 + ... + 1223383071.

It is an arithmetic number, because the mean of its divisors is an integer number (1126727824242).

Almost surely, 2^{21213312122010} is an apocalyptic number.

21213312122010 is an abundant number, since it is smaller than the sum of its proper divisors (32869623441606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213312122010 is a wasteful number, since it uses less digits than its factorization.

21213312122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446748847 (or 2446748830 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21213312122010 its reverse (1022121331212), we get a palindrome (22235433453222).

The spelling of 21213312122010 in words is "twenty-one trillion, two hundred thirteen billion, three hundred twelve million, one hundred twenty-two thousand, ten".