202121312020 has 12 divisors (see below), whose sum is σ = 424454755284. Its totient is φ = 80848524800.

The previous prime is 202121312011. The next prime is 202121312027. The reversal of 202121312020 is 20213121202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 105632800144 + 96488511876 = 325012^2 + 310626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 202121311985 and 202121312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121312027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5053032781 + ... + 5053032820.

It is an arithmetic number, because the mean of its divisors is an integer number (35371229607).

Almost surely, 2^202121312020 is an apocalyptic number.

202121312020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121312020 is an abundant number, since it is smaller than the sum of its proper divisors (222333443264).

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

202121312020 is a wasteful number, since it uses less digits than its factorization.

202121312020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106065610 (or 10106065608 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 202121312020 its reverse (20213121202), we get a palindrome (222334433222).

The spelling of 202121312020 in words is "two hundred two billion, one hundred twenty-one million, three hundred twelve thousand, twenty".