102001012020 has 96 divisors (see below), whose sum is σ = 317383395840. Its totient is φ = 27196248960.

The previous prime is 102001012019. The next prime is 102001012039. The reversal of 102001012020 is 20210100201.

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 = 102001011993 and 102001012011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6203410 + ... + 6219830.

It is an arithmetic number, because the mean of its divisors is an integer number (3306077040).

Almost surely, 2^102001012020 is an apocalyptic number.

102001012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102001012020 is an abundant number, since it is smaller than the sum of its proper divisors (215382383820).

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

102001012020 is a wasteful number, since it uses less digits than its factorization.

102001012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27942 (or 27934 counting only the distinct ones).

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

Adding to 102001012020 its reverse (20210100201), we get a palindrome (122211112221).

The spelling of 102001012020 in words is "one hundred two billion, one million, twelve thousand, twenty".