21211222320120 has 128 divisors (see below), whose sum is σ = 72863244311040. Its totient is φ = 4839009154560.

The previous prime is 21211222320103. The next prime is 21211222320161. The reversal of 21211222320120 is 2102322211212.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 23701651 + ... + 24580290.

It is an arithmetic number, because the mean of its divisors is an integer number (569244096180).

Almost surely, 2^{21211222320120} is an apocalyptic number.

21211222320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211222320120 is an abundant number, since it is smaller than the sum of its proper divisors (51652021990920).

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

21211222320120 is a wasteful number, since it uses less digits than its factorization.

21211222320120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48282485 (or 48282481 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21211222320120 its reverse (2102322211212), we get a palindrome (23313544531332).

The spelling of 21211222320120 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, three hundred twenty thousand, one hundred twenty".