121221102120 has 32 divisors (see below), whose sum is σ = 363663306720. Its totient is φ = 32325627200.

The previous prime is 121221102097. The next prime is 121221102143. The reversal of 121221102120 is 21201122121.

It is an interprime number because it is at equal distance from previous prime (121221102097) and next prime (121221102143).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121221102120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505087806 + ... + 505088045.

It is an arithmetic number, because the mean of its divisors is an integer number (11364478335).

Almost surely, 2^121221102120 is an apocalyptic number.

121221102120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221102120 is an abundant number, since it is smaller than the sum of its proper divisors (242442204600).

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

121221102120 is a wasteful number, since it uses less digits than its factorization.

121221102120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010175865 (or 1010175861 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221102120 its reverse (21201122121), we get a palindrome (142422224241).

The spelling of 121221102120 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty".