210120020100 has 54 divisors (see below), whose sum is σ = 658609532490. Its totient is φ = 56032005120.

The previous prime is 210120020087. The next prime is 210120020141. The reversal of 210120020100 is 1020021012.

It can be written as a sum of positive squares in 3 ways, for example, as 16437291264 + 193682728836 = 128208^2 + 440094^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 116732445 + ... + 116734244.

Almost surely, 2^210120020100 is an apocalyptic number.

210120020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210120020100 is an abundant number, since it is smaller than the sum of its proper divisors (448489512390).

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

210120020100 is a wasteful number, since it uses less digits than its factorization.

210120020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233466709 (or 233466699 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210120020100 its reverse (1020021012), we get a palindrome (211140041112).

The spelling of 210120020100 in words is "two hundred ten billion, one hundred twenty million, twenty thousand, one hundred".