102002121020 has 12 divisors (see below), whose sum is σ = 214204454184. Its totient is φ = 40800848400.

The previous prime is 102002120999. The next prime is 102002121049. The reversal of 102002121020 is 20121200201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 102002120992 and 102002121010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550053006 + ... + 2550053045.

It is an arithmetic number, because the mean of its divisors is an integer number (17850371182).

Almost surely, 2^102002121020 is an apocalyptic number.

102002121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102002121020 is an abundant number, since it is smaller than the sum of its proper divisors (112202333164).

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

102002121020 is a wasteful number, since it uses less digits than its factorization.

102002121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100106060 (or 5100106058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102002121020 its reverse (20121200201), we get a palindrome (122123321221).

The spelling of 102002121020 in words is "one hundred two billion, two million, one hundred twenty-one thousand, twenty".