21221111000012 has 96 divisors (see below), whose sum is σ = 49354411008000. Its totient is φ = 7733659602240.

The previous prime is 21221110999961. The next prime is 21221111000021. The reversal of 21221111000012 is 21000011112212.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22488962 + ... + 23413577.

It is an arithmetic number, because the mean of its divisors is an integer number (514108448000).

Almost surely, 2^{21221111000012} is an apocalyptic number.

21221111000012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221111000012 is an abundant number, since it is smaller than the sum of its proper divisors (28133300007988).

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

21221111000012 is a wasteful number, since it uses less digits than its factorization.

21221111000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45902659 (or 45902657 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221111000012 its reverse (21000011112212), we get a palindrome (42221122112224).

The spelling of 21221111000012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twelve", and thus it is an aban number.