210100102020 has 60 divisors (see below), whose sum is σ = 659091806604. Its totient is φ = 56026693440.

The previous prime is 210100102013. The next prime is 210100102097. The reversal of 210100102020 is 20201001012.

It can be written as a sum of positive squares in 2 ways, for example, as 65414200644 + 144685901376 = 255762^2 + 380376^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-3 number, since 3×210100102020³ (a number of 35 digits) contains 333 as substring.

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 = 210100101993 and 210100102011.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 64844091 + ... + 64847330.

Almost surely, 2^210100102020 is an apocalyptic number.

210100102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210100102020 is an abundant number, since it is smaller than the sum of its proper divisors (448991704584).

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

210100102020 is a wasteful number, since it uses less digits than its factorization.

210100102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129691442 (or 129691431 counting only the distinct ones).

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

Adding to 210100102020 its reverse (20201001012), we get a palindrome (230301103032).

The spelling of 210100102020 in words is "two hundred ten billion, one hundred million, one hundred two thousand, twenty".