202100102020 has 12 divisors (see below), whose sum is σ = 424410214284. Its totient is φ = 80840040800.

The previous prime is 202100101997. The next prime is 202100102027. The reversal of 202100102020 is 20201001202.

It can be written as a sum of positive squares in 2 ways, for example, as 99391389696 + 102708712324 = 315264^2 + 320482^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 202100101988 and 202100102006.

It is not an unprimeable number, because it can be changed into a prime (202100102027) 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, 5052502531 + ... + 5052502570.

It is an arithmetic number, because the mean of its divisors is an integer number (35367517857).

Almost surely, 2^202100102020 is an apocalyptic number.

202100102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202100102020 is an abundant number, since it is smaller than the sum of its proper divisors (222310112264).

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

202100102020 is a wasteful number, since it uses less digits than its factorization.

202100102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105005110 (or 10105005108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 202100102020 its reverse (20201001202), we get a palindrome (222301103222).

The spelling of 202100102020 in words is "two hundred two billion, one hundred million, one hundred two thousand, twenty".