121155355525513 has 4 divisors (see below), whose sum is σ = 121155695973648. Its totient is φ = 121155015077380.

The previous prime is 121155355525459. The next prime is 121155355525517. The reversal of 121155355525513 is 315525553551121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121155355525513 - 2²⁵ = 121155321971081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121155355525517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169689703 + ... + 170402188.

It is an arithmetic number, because the mean of its divisors is an integer number (30288923993412).

Almost surely, 2^{121155355525513} is an apocalyptic number.

It is an amenable number.

121155355525513 is a deficient number, since it is larger than the sum of its proper divisors (340448135).

121155355525513 is an equidigital number, since it uses as much as digits as its factorization.

121155355525513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340448134.

The product of its digits is 2812500, while the sum is 49.

The spelling of 121155355525513 in words is "one hundred twenty-one trillion, one hundred fifty-five billion, three hundred fifty-five million, five hundred twenty-five thousand, five hundred thirteen".