202122212100 has 72 divisors (see below), whose sum is σ = 585611976768. Its totient is φ = 53825059200.

The previous prime is 202122212069. The next prime is 202122212143. The reversal of 202122212100 is 1212221202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 202122212100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245271 + ... + 681470.

Almost surely, 2^202122212100 is an apocalyptic number.

202122212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202122212100 is an abundant number, since it is smaller than the sum of its proper divisors (383489764668).

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

202122212100 is a wasteful number, since it uses less digits than its factorization.

202122212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927485 (or 927478 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202122212100 its reverse (1212221202), we get a palindrome (203334433302).

The spelling of 202122212100 in words is "two hundred two billion, one hundred twenty-two million, two hundred twelve thousand, one hundred".