202121210220 has 96 divisors (see below), whose sum is σ = 579205251072. Its totient is φ = 52644703488.

The previous prime is 202121210219. The next prime is 202121210233. The reversal of 202121210220 is 22012121202.

202121210220 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 202121210220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566629 + ... + 851651.

It is an arithmetic number, because the mean of its divisors is an integer number (6033388032).

Almost surely, 2^202121210220 is an apocalyptic number.

202121210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202121210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289602625536).

202121210220 is an abundant number, since it is smaller than the sum of its proper divisors (377084040852).

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

202121210220 is a wasteful number, since it uses less digits than its factorization.

202121210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285311 (or 285309 counting only the distinct ones).

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

Adding to 202121210220 its reverse (22012121202), we get a palindrome (224133331422).

The spelling of 202121210220 in words is "two hundred two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty".