121200020999900 has 36 divisors (see below), whose sum is σ = 263004534471000. Its totient is φ = 48479918280000.

The previous prime is 121200020999899. The next prime is 121200021000031. The reversal of 121200020999900 is 9999020002121.

It is a happy number.

It is a congruent number.

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, 88092275 + ... + 89457525.

Almost surely, 2^{121200020999900} is an apocalyptic number.

121200020999900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200020999900 is an abundant number, since it is smaller than the sum of its proper divisors (141804513471100).

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

121200020999900 is a wasteful number, since it uses less digits than its factorization.

121200020999900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253014 (or 2253007 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 121200020999900 in words is "one hundred twenty-one trillion, two hundred billion, twenty million, nine hundred ninety-nine thousand, nine hundred".