210221320020 has 24 divisors (see below), whose sum is σ = 588619696224. Its totient is φ = 56059018656.

The previous prime is 210221320013. The next prime is 210221320033. The reversal of 210221320020 is 20023122012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 1751844274 + ... + 1751844393.

It is an arithmetic number, because the mean of its divisors is an integer number (24525820676).

Almost surely, 2^210221320020 is an apocalyptic number.

210221320020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221320020 is an abundant number, since it is smaller than the sum of its proper divisors (378398376204).

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

210221320020 is a wasteful number, since it uses less digits than its factorization.

210221320020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503688679 (or 3503688677 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 210221320020 its reverse (20023122012), we get a palindrome (230244442032).

The spelling of 210221320020 in words is "two hundred ten billion, two hundred twenty-one million, three hundred twenty thousand, twenty".