21221120012000 has 96 divisors (see below), whose sum is σ = 52141775160384. Its totient is φ = 8488206528000.

The previous prime is 21221120011999. The next prime is 21221120012011. The reversal of 21221120012000 is 21002112212.

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, 222884405 + ... + 222979595.

It is an arithmetic number, because the mean of its divisors is an integer number (543143491254).

Almost surely, 2^{21221120012000} is an apocalyptic number.

21221120012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221120012000 is an abundant number, since it is smaller than the sum of its proper divisors (30920655148384).

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

21221120012000 is an equidigital number, since it uses as much as digits as its factorization.

21221120012000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150949 (or 150931 counting only the distinct ones).

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

Adding to 21221120012000 its reverse (21002112212), we get a palindrome (21242122124212).

The spelling of 21221120012000 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, twelve thousand".