121010021100 has 108 divisors (see below), whose sum is σ = 387369519264. Its totient is φ = 31582746240.

The previous prime is 121010021087. The next prime is 121010021123. The reversal of 121010021100 is 1120010121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

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 35 ways as a sum of consecutive naturals, for example, 1388079 + ... + 1472678.

It is an arithmetic number, because the mean of its divisors is an integer number (3586754808).

Almost surely, 2^121010021100 is an apocalyptic number.

121010021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121010021100 is an abundant number, since it is smaller than the sum of its proper divisors (266359498164).

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

121010021100 is a wasteful number, since it uses less digits than its factorization.

121010021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860824 (or 2860814 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121010021100 its reverse (1120010121), we get a palindrome (122130031221).

It can be divided in two parts, 121010021 and 100, that added together give a palindrome (121010121).

The spelling of 121010021100 in words is "one hundred twenty-one billion, ten million, twenty-one thousand, one hundred".