202100101020 has 36 divisors (see below), whose sum is σ = 613036973640. Its totient is φ = 53893360224.

The previous prime is 202100100991. The next prime is 202100101031. The reversal of 202100101020 is 20101001202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 202100100993 and 202100101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 561388990 + ... + 561389349.

Almost surely, 2^202100101020 is an apocalyptic number.

202100101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202100101020 is an abundant number, since it is smaller than the sum of its proper divisors (410936872620).

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

202100101020 is a wasteful number, since it uses less digits than its factorization.

202100101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122778354 (or 1122778349 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 202100101020 its reverse (20101001202), we get a palindrome (222201102222).

The spelling of 202100101020 in words is "two hundred two billion, one hundred million, one hundred one thousand, twenty".