202121020020 has 24 divisors (see below), whose sum is σ = 565938856224. Its totient is φ = 53898938656.

The previous prime is 202121019977. The next prime is 202121020043. The reversal of 202121020020 is 20020121202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 202121019978 and 202121020005.

It is a congruent number.

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, 1684341774 + ... + 1684341893.

It is an arithmetic number, because the mean of its divisors is an integer number (23580785676).

Almost surely, 2^202121020020 is an apocalyptic number.

202121020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121020020 is an abundant number, since it is smaller than the sum of its proper divisors (363817836204).

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

202121020020 is a wasteful number, since it uses less digits than its factorization.

202121020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368683679 (or 3368683677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 202121020020 its reverse (20020121202), we get a palindrome (222141141222).

The spelling of 202121020020 in words is "two hundred two billion, one hundred twenty-one million, twenty thousand, twenty".