21221101220010 has 64 divisors (see below), whose sum is σ = 51692106517632. Its totient is φ = 5574357524736.

The previous prime is 21221101219991. The next prime is 21221101220057. The reversal of 21221101220010 is 1002210112212.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 97201092 + ... + 97419168.

It is an arithmetic number, because the mean of its divisors is an integer number (807689164338).

Almost surely, 2^{21221101220010} is an apocalyptic number.

21221101220010 is an abundant number, since it is smaller than the sum of its proper divisors (30471005297622).

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

21221101220010 is a wasteful number, since it uses less digits than its factorization.

21221101220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266567.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221101220010 its reverse (1002210112212), we get a palindrome (22223311332222).

The spelling of 21221101220010 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty thousand, ten".