21121222111010 has 64 divisors (see below), whose sum is σ = 43554465137664. Its totient is φ = 7224049536000.

The previous prime is 21121222111009. The next prime is 21121222111091. The reversal of 21121222111010 is 1011122212112.

It is a super-2 number, since 2×21121222111010² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121222111010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374109944 + ... + 374166396.

It is an arithmetic number, because the mean of its divisors is an integer number (680538517776).

Almost surely, 2^{21121222111010} is an apocalyptic number.

21121222111010 is an abundant number, since it is smaller than the sum of its proper divisors (22433243026654).

21121222111010 is a wasteful number, since it uses less digits than its factorization.

21121222111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69299.

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

Adding to 21121222111010 its reverse (1011122212112), we get a palindrome (22132344323122).

The spelling of 21121222111010 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, ten".