202121030100 has 72 divisors (see below), whose sum is σ = 637967479968. Its totient is φ = 48999036800.

The previous prime is 202121030077. The next prime is 202121030113. The reversal of 202121030100 is 1030121202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 30621099 + ... + 30627698.

It is an arithmetic number, because the mean of its divisors is an integer number (8860659444).

Almost surely, 2^202121030100 is an apocalyptic number.

202121030100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121030100 is an abundant number, since it is smaller than the sum of its proper divisors (435846449868).

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

202121030100 is a wasteful number, since it uses less digits than its factorization.

202121030100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61248825 (or 61248818 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 202121030100 its reverse (1030121202), we get a palindrome (203151151302).

The spelling of 202121030100 in words is "two hundred two billion, one hundred twenty-one million, thirty thousand, one hundred".