21102121110 has 32 divisors (see below), whose sum is σ = 57880104192. Its totient is φ = 4823341920.

The previous prime is 21102121093. The next prime is 21102121123. The reversal of 21102121110 is 1112120112.

It is a super-2 number, since 2×21102121110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 50242936 + ... + 50243355.

It is an arithmetic number, because the mean of its divisors is an integer number (1808753256).

Almost surely, 2^21102121110 is an apocalyptic number.

21102121110 is an abundant number, since it is smaller than the sum of its proper divisors (36777983082).

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

21102121110 is a wasteful number, since it uses less digits than its factorization.

21102121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100486308.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21102121110 its reverse (1112120112), we get a palindrome (22214241222).

The spelling of 21102121110 in words is "twenty-one billion, one hundred two million, one hundred twenty-one thousand, one hundred ten".