210021112020 has 96 divisors (see below), whose sum is σ = 622809468288. Its totient is φ = 52697751552.

The previous prime is 210021112013. The next prime is 210021112061. The reversal of 210021112020 is 20211120012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210021111987 and 210021112005.

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, 4334367 + ... + 4382553.

It is an arithmetic number, because the mean of its divisors is an integer number (6487598628).

Almost surely, 2^210021112020 is an apocalyptic number.

210021112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021112020 is an abundant number, since it is smaller than the sum of its proper divisors (412788356268).

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

210021112020 is a wasteful number, since it uses less digits than its factorization.

210021112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52489 (or 52487 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210021112020 its reverse (20211120012), we get a palindrome (230232232032).

The spelling of 210021112020 in words is "two hundred ten billion, twenty-one million, one hundred twelve thousand, twenty".