210021202120020 has 24 divisors (see below), whose sum is σ = 588059365936224. Its totient is φ = 56005653898656.

The previous prime is 210021202120007. The next prime is 210021202120069. The reversal of 210021202120020 is 20021202120012.

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, 1750176684274 + ... + 1750176684393.

It is an arithmetic number, because the mean of its divisors is an integer number (24502473580676).

Almost surely, 2^{210021202120020} is an apocalyptic number.

210021202120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021202120020 is an abundant number, since it is smaller than the sum of its proper divisors (378038163816204).

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

210021202120020 is a wasteful number, since it uses less digits than its factorization.

210021202120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500353368679 (or 3500353368677 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 210021202120020 its reverse (20021202120012), we get a palindrome (230042404240032).

The spelling of 210021202120020 in words is "two hundred ten trillion, twenty-one billion, two hundred two million, one hundred twenty thousand, twenty".