21121111202110 has 128 divisors (see below), whose sum is σ = 42332721500160. Its totient is φ = 7553956838400.

The previous prime is 21121111202099. The next prime is 21121111202161. The reversal of 21121111202110 is 1120211112112.

It is a super-2 number, since 2×21121111202110² (a number of 27 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 63 ways as a sum of consecutive naturals, for example, 740635572 + ... + 740664088.

It is an arithmetic number, because the mean of its divisors is an integer number (330724386720).

Almost surely, 2^{21121111202110} is an apocalyptic number.

21121111202110 is an abundant number, since it is smaller than the sum of its proper divisors (21211610298050).

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

21121111202110 is a wasteful number, since it uses less digits than its factorization.

21121111202110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31682.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21121111202110 its reverse (1120211112112), we get a palindrome (22241322314222).

The spelling of 21121111202110 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred two thousand, one hundred ten".