121311397057500 has 540 divisors, whose sum is σ = 416048293885224. Its totient is φ = 29780861760000.

The previous prime is 121311397057453. The next prime is 121311397057511. The reversal of 121311397057500 is 5750793113121.

121311397057500 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 1 + 1 + 3 + 9 + 70 + 575 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 1418289735 + ... + 1418375265.

Almost surely, 2^{121311397057500} is an apocalyptic number.

121311397057500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121311397057500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208024146942612).

121311397057500 is an abundant number, since it is smaller than the sum of its proper divisors (294736896827724).

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

121311397057500 is a wasteful number, since it uses less digits than its factorization.

121311397057500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85960 (or 85927 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

The spelling of 121311397057500 in words is "one hundred twenty-one trillion, three hundred eleven billion, three hundred ninety-seven million, fifty-seven thousand, five hundred".