210221111220020 has 48 divisors (see below), whose sum is σ = 465103034726400. Its totient is φ = 79593524956800.

The previous prime is 210221111219989. The next prime is 210221111220053. The reversal of 210221111220020 is 20022111122012.

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, 239881235 + ... + 240755994.

It is an arithmetic number, because the mean of its divisors is an integer number (9689646556800).

Almost surely, 2^{210221111220020} is an apocalyptic number.

210221111220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221111220020 is an abundant number, since it is smaller than the sum of its proper divisors (254881923506380).

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

210221111220020 is a wasteful number, since it uses less digits than its factorization.

210221111220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480638408 (or 480638406 counting only the distinct ones).

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

Adding to 210221111220020 its reverse (20022111122012), we get a palindrome (230243222342032).

The spelling of 210221111220020 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, twenty".