210021011020 has 24 divisors (see below), whose sum is σ = 441850442544. Its totient is φ = 83854819776.

The previous prime is 210021010981. The next prime is 210021011033. The reversal of 210021011020 is 20110120012.

It is a super-2 number, since 2×210021011020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 210021010988 and 210021011006.

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, 9587827 + ... + 9609706.

It is an arithmetic number, because the mean of its divisors is an integer number (18410435106).

Almost surely, 2^210021011020 is an apocalyptic number.

210021011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021011020 is an abundant number, since it is smaller than the sum of its proper divisors (231829431524).

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

210021011020 is a wasteful number, since it uses less digits than its factorization.

210021011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19198089 (or 19198087 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210021011020 its reverse (20110120012), we get a palindrome (230131131032).

The spelling of 210021011020 in words is "two hundred ten billion, twenty-one million, eleven thousand, twenty".