202102210100020 has 24 divisors (see below), whose sum is σ = 424652675295744. Its totient is φ = 80795544214176.

The previous prime is 202102210099991. The next prime is 202102210100047. The reversal of 202102210100020 is 20001012201202.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2833702564 + ... + 2833773883.

It is an arithmetic number, because the mean of its divisors is an integer number (17693861470656).

Almost surely, 2^{202102210100020} is an apocalyptic number.

202102210100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202102210100020 is an abundant number, since it is smaller than the sum of its proper divisors (222550465195724).

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

202102210100020 is a wasteful number, since it uses less digits than its factorization.

202102210100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667478239 (or 5667478237 counting only the distinct ones).

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

Adding to 202102210100020 its reverse (20001012201202), we get a palindrome (222103222301222).

The spelling of 202102210100020 in words is "two hundred two trillion, one hundred two billion, two hundred ten million, one hundred thousand, twenty".