21221101112120 has 128 divisors (see below), whose sum is σ = 59044640739840. Its totient is φ = 6684298467840.

The previous prime is 21221101112119. The next prime is 21221101112177. The reversal of 21221101112120 is 2121110112212.

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, 13047062 + ... + 14583141.

It is an arithmetic number, because the mean of its divisors is an integer number (461286255780).

Almost surely, 2^{21221101112120} is an apocalyptic number.

21221101112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221101112120 is an abundant number, since it is smaller than the sum of its proper divisors (37823539627720).

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

21221101112120 is a wasteful number, since it uses less digits than its factorization.

21221101112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27630445 (or 27630441 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221101112120 its reverse (2121110112212), we get a palindrome (23342211224332).

The spelling of 21221101112120 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, one hundred twelve thousand, one hundred twenty".