202102021100 has 72 divisors (see below), whose sum is σ = 504288223488. Its totient is φ = 68866977600.

The previous prime is 202102021073. The next prime is 202102021109. The reversal of 202102021100 is 1120201202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (202102021109) 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, 771536 + ... + 999735.

It is an arithmetic number, because the mean of its divisors is an integer number (7004003104).

Almost surely, 2^202102021100 is an apocalyptic number.

202102021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202102021100 is an abundant number, since it is smaller than the sum of its proper divisors (302186202388).

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

202102021100 is a wasteful number, since it uses less digits than its factorization.

202102021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771455 (or 1771448 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 202102021100 its reverse (1120201202), we get a palindrome (203222222302).

The spelling of 202102021100 in words is "two hundred two billion, one hundred two million, twenty-one thousand, one hundred".