121012221011100 has 72 divisors (see below), whose sum is σ = 350606358767280. Its totient is φ = 32225901089280.

The previous prime is 121012221011051. The next prime is 121012221011197. The reversal of 121012221011100 is 1110122210121.

It is a happy number.

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 121012221011100.

It is a congruent number.

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, 274932945 + ... + 275372744.

Almost surely, 2^{121012221011100} is an apocalyptic number.

121012221011100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121012221011100 is an abundant number, since it is smaller than the sum of its proper divisors (229594137756180).

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

121012221011100 is a wasteful number, since it uses less digits than its factorization.

121012221011100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550306439 (or 550306432 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121012221011100 its reverse (1110122210121), we get a palindrome (122122343221221).

The spelling of 121012221011100 in words is "one hundred twenty-one trillion, twelve billion, two hundred twenty-one million, eleven thousand, one hundred".