202121102220 has 48 divisors (see below), whose sum is σ = 585454232160. Its totient is φ = 52040375296.

The previous prime is 202121102203. The next prime is 202121102233. The reversal of 202121102220 is 22201121202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 202121102220.

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, 58079037 + ... + 58082516.

It is an arithmetic number, because the mean of its divisors is an integer number (12196963170).

Almost surely, 2^202121102220 is an apocalyptic number.

202121102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121102220 is an abundant number, since it is smaller than the sum of its proper divisors (383333129940).

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

202121102220 is a wasteful number, since it uses less digits than its factorization.

202121102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116161594 (or 116161592 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202121102220 its reverse (22201121202), we get a palindrome (224322223422).

The spelling of 202121102220 in words is "two hundred two billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty".