101021200020 has 108 divisors (see below), whose sum is σ = 331815887676. Its totient is φ = 24866749440.

The previous prime is 101021200009. The next prime is 101021200097. The reversal of 101021200020 is 20002120101.

It can be written as a sum of positive squares in 6 ways, for example, as 3598560144 + 97422639876 = 59988^2 + 312126^2 .

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 = 101021199975 and 101021200011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1630021 + ... + 1690860.

Almost surely, 2^101021200020 is an apocalyptic number.

101021200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101021200020 is an abundant number, since it is smaller than the sum of its proper divisors (230794687656).

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

101021200020 is a wasteful number, since it uses less digits than its factorization.

101021200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320922 (or 3320904 counting only the distinct ones).

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

Adding to 101021200020 its reverse (20002120101), we get a palindrome (121023320121).

The spelling of 101021200020 in words is "one hundred one billion, twenty-one million, two hundred thousand, twenty".