102001001020 has 24 divisors (see below), whose sum is σ = 214257514464. Its totient is φ = 40789845696.

The previous prime is 102001000999. The next prime is 102001001057. The reversal of 102001001020 is 20100100201.

It is a junction number, because it is equal to n+sod(n) for n = 102001000994 and 102001001012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580192 + ... + 735271.

It is an arithmetic number, because the mean of its divisors is an integer number (8927396436).

Almost surely, 2^102001001020 is an apocalyptic number.

102001001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102001001020 is an abundant number, since it is smaller than the sum of its proper divisors (112256513444).

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

102001001020 is a wasteful number, since it uses less digits than its factorization.

102001001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319349 (or 1319347 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 102001001020 its reverse (20100100201), we get a palindrome (122101101221).

The spelling of 102001001020 in words is "one hundred two billion, one million, one thousand, twenty".