2100200021000 has 64 divisors (see below), whose sum is σ = 4919692854960. Its totient is φ = 839186880000.

The previous prime is 2100200020981. The next prime is 2100200021027. The reversal of 2100200021000 is 1200020012.

It can be written as a sum of positive squares in 8 ways, for example, as 35466682276 + 2064733338724 = 188326^2 + 1436918^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174941 + ... + 2056940.

Almost surely, 2^{2100200021000} is an apocalyptic number.

2100200021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100200021000 is an abundant number, since it is smaller than the sum of its proper divisors (2819492833960).

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

2100200021000 is a wasteful number, since it uses less digits than its factorization.

2100200021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232843 (or 2232829 counting only the distinct ones).

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

Adding to 2100200021000 its reverse (1200020012), we get a palindrome (2101400041012).

The spelling of 2100200021000 in words is "two trillion, one hundred billion, two hundred million, twenty-one thousand".