121002010020 has 72 divisors (see below), whose sum is σ = 368336544576. Its totient is φ = 32153170752.

The previous prime is 121002010009. The next prime is 121002010033. The reversal of 121002010020 is 20010200121.

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 = 121002009984 and 121002010011.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1136752 + ... + 1238631.

Almost surely, 2^121002010020 is an apocalyptic number.

121002010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002010020 is an abundant number, since it is smaller than the sum of its proper divisors (247334534556).

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

121002010020 is a wasteful number, since it uses less digits than its factorization.

121002010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375681 (or 2375676 counting only the distinct ones).

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

Adding to 121002010020 its reverse (20010200121), we get a palindrome (141012210141).

The spelling of 121002010020 in words is "one hundred twenty-one billion, two million, ten thousand, twenty".