21221211020120 has 32 divisors (see below), whose sum is σ = 47750945584320. Its totient is φ = 8487911823360.

The previous prime is 21221211020117. The next prime is 21221211020137. The reversal of 21221211020120 is 2102011212212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17292617 + ... + 18479096.

It is an arithmetic number, because the mean of its divisors is an integer number (1492217049510).

Almost surely, 2^{21221211020120} is an apocalyptic number.

21221211020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221211020120 is an abundant number, since it is smaller than the sum of its proper divisors (26529734564200).

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

21221211020120 is a wasteful number, since it uses less digits than its factorization.

21221211020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35786555 (or 35786551 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221211020120 its reverse (2102011212212), we get a palindrome (23323222232332).

The spelling of 21221211020120 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, twenty thousand, one hundred twenty".