202120121220 has 24 divisors (see below), whose sum is σ = 565936339584. Its totient is φ = 53898698976.

The previous prime is 202120121201. The next prime is 202120121233. The reversal of 202120121220 is 22121021202.

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 202120121220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1684334284 + ... + 1684334403.

It is an arithmetic number, because the mean of its divisors is an integer number (23580680816).

Almost surely, 2^202120121220 is an apocalyptic number.

202120121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202120121220 is an abundant number, since it is smaller than the sum of its proper divisors (363816218364).

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

202120121220 is a wasteful number, since it uses less digits than its factorization.

202120121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368668699 (or 3368668697 counting only the distinct ones).

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

Adding to 202120121220 its reverse (22121021202), we get a palindrome (224241142422).

The spelling of 202120121220 in words is "two hundred two billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty".