210002120100 has 72 divisors (see below), whose sum is σ = 675117935520. Its totient is φ = 56000564640.

The previous prime is 210002120099. The next prime is 210002120101. The reversal of 210002120100 is 1021200012.

It is an interprime number because it is at equal distance from previous prime (210002120099) and next prime (210002120101).

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

It is not an unprimeable number, because it can be changed into a prime (210002120101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38886582 + ... + 38891981.

Almost surely, 2^210002120100 is an apocalyptic number.

210002120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210002120100 is an abundant number, since it is smaller than the sum of its proper divisors (465115815420).

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

210002120100 is a wasteful number, since it uses less digits than its factorization.

210002120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778586 (or 77778573 counting only the distinct ones).

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

Adding to 210002120100 its reverse (1021200012), we get a palindrome (211023320112).

The spelling of 210002120100 in words is "two hundred ten billion, two million, one hundred twenty thousand, one hundred".