21112112021210 has 32 divisors (see below), whose sum is σ = 45716453101440. Its totient is φ = 6857467964352.

The previous prime is 21112112021167. The next prime is 21112112021279. The reversal of 21112112021210 is 1212021121112.

It is a super-2 number, since 2×21112112021210² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7936882889 + ... + 7936885548.

It is an arithmetic number, because the mean of its divisors is an integer number (1428639159420).

Almost surely, 2^{21112112021210} is an apocalyptic number.

21112112021210 is an abundant number, since it is smaller than the sum of its proper divisors (24604341080230).

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

21112112021210 is a wasteful number, since it uses less digits than its factorization.

21112112021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15873768470.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21112112021210 its reverse (1212021121112), we get a palindrome (22324133142322).

The spelling of 21112112021210 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, twenty-one thousand, two hundred ten".