202012121020 has 24 divisors (see below), whose sum is σ = 424237209984. Its totient is φ = 80802609216.

The previous prime is 202012120991. The next prime is 202012121021. The reversal of 202012121020 is 20121210202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202012121021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732469 + ... + 969811.

It is an arithmetic number, because the mean of its divisors is an integer number (17676550416).

Almost surely, 2^202012121020 is an apocalyptic number.

202012121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202012121020 is an abundant number, since it is smaller than the sum of its proper divisors (222225088964).

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

202012121020 is a wasteful number, since it uses less digits than its factorization.

202012121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279909 (or 279907 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202012121020 its reverse (20121210202), we get a palindrome (222133331222).

The spelling of 202012121020 in words is "two hundred two billion, twelve million, one hundred twenty-one thousand, twenty".