2100021202120 has 32 divisors (see below), whose sum is σ = 4840292774520. Its totient is φ = 819520468480.

The previous prime is 2100021202093. The next prime is 2100021202171. The reversal of 2100021202120 is 212021200012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1763419331844 + 336601870276 = 1327938^2 + 580174^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2100021202120.

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, 640248727 + ... + 640252006.

Almost surely, 2^{2100021202120} is an apocalyptic number.

2100021202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100021202120 is an abundant number, since it is smaller than the sum of its proper divisors (2740271572400).

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

2100021202120 is a wasteful number, since it uses less digits than its factorization.

2100021202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280500785 (or 1280500781 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2100021202120 its reverse (212021200012), we get a palindrome (2312042402132).

The spelling of 2100021202120 in words is "two trillion, one hundred billion, twenty-one million, two hundred two thousand, one hundred twenty".