121010020120 has 64 divisors (see below), whose sum is σ = 297169171200. Its totient is φ = 43982225280.

The previous prime is 121010020099. The next prime is 121010020163. The reversal of 121010020120 is 21020010121.

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 = 121010020097 and 121010020106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852391 + ... + 984169.

It is an arithmetic number, because the mean of its divisors is an integer number (4643268300).

Almost surely, 2^121010020120 is an apocalyptic number.

121010020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121010020120 is an abundant number, since it is smaller than the sum of its proper divisors (176159151080).

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

121010020120 is a wasteful number, since it uses less digits than its factorization.

121010020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133888 (or 133884 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121010020120 its reverse (21020010121), we get a palindrome (142030030241).

Subtracting from 121010020120 its reverse (21020010121), we obtain a palindrome (99990009999).

The spelling of 121010020120 in words is "one hundred twenty-one billion, ten million, twenty thousand, one hundred twenty".