202120212100 has 72 divisors (see below), whose sum is σ = 469253993600. Its totient is φ = 75337257600.

The previous prime is 202120212037. The next prime is 202120212103. The reversal of 202120212100 is 1212021202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (202120212103) 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, 756060 + ... + 987859.

Almost surely, 2^202120212100 is an apocalyptic number.

202120212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202120212100 is an abundant number, since it is smaller than the sum of its proper divisors (267133781500).

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

202120212100 is a wasteful number, since it uses less digits than its factorization.

202120212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744013 (or 1744006 counting only the distinct ones).

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

Adding to 202120212100 its reverse (1212021202), we get a palindrome (203332233302).

It can be divided in two parts, 2021202 and 12100, that added together give a palindrome (2033302).

The spelling of 202120212100 in words is "two hundred two billion, one hundred twenty million, two hundred twelve thousand, one hundred".