202121022020 has 12 divisors (see below), whose sum is σ = 424454146284. Its totient is φ = 80848408800.

The previous prime is 202121021989. The next prime is 202121022023. The reversal of 202121022020 is 20220121202.

202121022020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104685896704 + 97435125316 = 323552^2 + 312146^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202121021986 and 202121022004.

It is not an unprimeable number, because it can be changed into a prime (202121022023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5053025531 + ... + 5053025570.

It is an arithmetic number, because the mean of its divisors is an integer number (35371178857).

Almost surely, 2^202121022020 is an apocalyptic number.

202121022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121022020 is an abundant number, since it is smaller than the sum of its proper divisors (222333124264).

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

202121022020 is a wasteful number, since it uses less digits than its factorization.

202121022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10106051110 (or 10106051108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202121022020 its reverse (20220121202), we get a palindrome (222341143222).

The spelling of 202121022020 in words is "two hundred two billion, one hundred twenty-one million, twenty-two thousand, twenty".