102021020020 has 24 divisors (see below), whose sum is σ = 216324186624. Its totient is φ = 40412209056.

The previous prime is 102021019999. The next prime is 102021020053. The reversal of 102021020020 is 20020120201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 102021019979 and 102021020006.

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, 24760324 + ... + 24764443.

It is an arithmetic number, because the mean of its divisors is an integer number (9013507776).

Almost surely, 2^102021020020 is an apocalyptic number.

102021020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021020020 is an abundant number, since it is smaller than the sum of its proper divisors (114303166604).

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

102021020020 is a wasteful number, since it uses less digits than its factorization.

102021020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49524879 (or 49524877 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 102021020020 its reverse (20020120201), we get a palindrome (122041140221).

The spelling of 102021020020 in words is "one hundred two billion, twenty-one million, twenty thousand, twenty".