210002100120 has 80 divisors (see below), whose sum is σ = 705840402960. Its totient is φ = 56000559168.

The previous prime is 210002100103. The next prime is 210002100127. The reversal of 210002100120 is 21001200012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002100127) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32404492 + ... + 32410971.

It is an arithmetic number, because the mean of its divisors is an integer number (8823005037).

Almost surely, 2^210002100120 is an apocalyptic number.

210002100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210002100120 is an abundant number, since it is smaller than the sum of its proper divisors (495838302840).

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

210002100120 is a wasteful number, since it uses less digits than its factorization.

210002100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64815486 (or 64815473 counting only the distinct ones).

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

Adding to 210002100120 its reverse (21001200012), we get a palindrome (231003300132).

The spelling of 210002100120 in words is "two hundred ten billion, two million, one hundred thousand, one hundred twenty".