102121002020 has 48 divisors (see below), whose sum is σ = 229110490560. Its totient is φ = 38120886144.

The previous prime is 102121001959. The next prime is 102121002089. The reversal of 102121002020 is 20200121201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 102121001992 and 102121002010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1980059 + ... + 2030978.

It is an arithmetic number, because the mean of its divisors is an integer number (4773135220).

Almost surely, 2^102121002020 is an apocalyptic number.

102121002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102121002020 is an abundant number, since it is smaller than the sum of its proper divisors (126989488540).

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

102121002020 is a wasteful number, since it uses less digits than its factorization.

102121002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011132 (or 4011130 counting only the distinct ones).

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

Adding to 102121002020 its reverse (20200121201), we get a palindrome (122321123221).

The spelling of 102121002020 in words is "one hundred two billion, one hundred twenty-one million, two thousand, twenty".