202121131220 has 48 divisors (see below), whose sum is σ = 441784748160. Its totient is φ = 77581639296.

The previous prime is 202121131211. The next prime is 202121131237. The reversal of 202121131220 is 22131121202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 974432 + ... + 1163511.

It is an arithmetic number, because the mean of its divisors is an integer number (9203848920).

Almost surely, 2^202121131220 is an apocalyptic number.

202121131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121131220 is an abundant number, since it is smaller than the sum of its proper divisors (239663616940).

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

202121131220 is a wasteful number, since it uses less digits than its factorization.

202121131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138144 (or 2138142 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 202121131220 its reverse (22131121202), we get a palindrome (224252252422).

The spelling of 202121131220 in words is "two hundred two billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".