121020021100 has 36 divisors (see below), whose sum is σ = 286487398008. Its totient is φ = 44007280000.

The previous prime is 121020021077. The next prime is 121020021179. The reversal of 121020021100 is 1120020121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55008001 + ... + 55010200.

It is an arithmetic number, because the mean of its divisors is an integer number (7957983278).

Almost surely, 2^121020021100 is an apocalyptic number.

121020021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121020021100 is an abundant number, since it is smaller than the sum of its proper divisors (165467376908).

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

121020021100 is a wasteful number, since it uses less digits than its factorization.

121020021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110018226 (or 110018219 counting only the distinct ones).

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

Adding to 121020021100 its reverse (1120020121), we get a palindrome (122140041221).

It can be divided in two parts, 121020021 and 100, that added together give a palindrome (121020121).

The spelling of 121020021100 in words is "one hundred twenty-one billion, twenty million, twenty-one thousand, one hundred".