202131223020 has 72 divisors (see below), whose sum is σ = 620518547376. Its totient is φ = 53252237952.

The previous prime is 202131223009. The next prime is 202131223051. The reversal of 202131223020 is 20322131202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 202131222984 and 202131223002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6749827 + ... + 6779706.

It is an arithmetic number, because the mean of its divisors is an integer number (8618313158).

Almost surely, 2^202131223020 is an apocalyptic number.

202131223020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202131223020 is an abundant number, since it is smaller than the sum of its proper divisors (418387324356).

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

202131223020 is a wasteful number, since it uses less digits than its factorization.

202131223020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13529631 (or 13529626 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 202131223020 its reverse (20322131202), we get a palindrome (222453354222).

The spelling of 202131223020 in words is "two hundred two billion, one hundred thirty-one million, two hundred twenty-three thousand, twenty".