21221000022110 has 64 divisors (see below), whose sum is σ = 45509009670144. Its totient is φ = 6971355504000.

The previous prime is 21221000022109. The next prime is 21221000022139. The reversal of 21221000022110 is 1122000012212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

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, 48193022 + ... + 48631361.

It is an arithmetic number, because the mean of its divisors is an integer number (711078276096).

Almost surely, 2^{21221000022110} is an apocalyptic number.

21221000022110 is an abundant number, since it is smaller than the sum of its proper divisors (24288009648034).

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

21221000022110 is a wasteful number, since it uses less digits than its factorization.

21221000022110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96824529.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221000022110 its reverse (1122000012212), we get a palindrome (22343000034322).

The spelling of 21221000022110 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two thousand, one hundred ten".