202021221100 has 18 divisors (see below), whose sum is σ = 438386050004. Its totient is φ = 80808488400.

The previous prime is 202021221067. The next prime is 202021221107. The reversal of 202021221100 is 1122120202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (202021221107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1010106006 + ... + 1010106205.

Almost surely, 2^202021221100 is an apocalyptic number.

202021221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202021221100 is an abundant number, since it is smaller than the sum of its proper divisors (236364828904).

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

202021221100 is a wasteful number, since it uses less digits than its factorization.

202021221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020212225 (or 2020212218 counting only the distinct ones).

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

Adding to 202021221100 its reverse (1122120202), we get a palindrome (203143341302).

The spelling of 202021221100 in words is "two hundred two billion, twenty-one million, two hundred twenty-one thousand, one hundred".