21120211221208 has 64 divisors (see below), whose sum is σ = 46532863825920. Its totient is φ = 8886484358400.

The previous prime is 21120211221199. The next prime is 21120211221233. The reversal of 21120211221208 is 80212211202112.

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, 168241885 + ... + 168367372.

It is an arithmetic number, because the mean of its divisors is an integer number (727075997280).

Almost surely, 2^{21120211221208} is an apocalyptic number.

It is an amenable number.

21120211221208 is an abundant number, since it is smaller than the sum of its proper divisors (25412652604712).

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

21120211221208 is a wasteful number, since it uses less digits than its factorization.

21120211221208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336609328 (or 336609324 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The spelling of 21120211221208 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eight".