121595501955 has 16 divisors (see below), whose sum is σ = 196738791840. Its totient is φ = 64122271488.

The previous prime is 121595501917. The next prime is 121595501971. The reversal of 121595501955 is 559105595121.

It is not a de Polignac number, because 121595501955 - 2¹⁰ = 121595500931 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45540052 + ... + 45542721.

It is an arithmetic number, because the mean of its divisors is an integer number (12296174490).

Almost surely, 2^121595501955 is an apocalyptic number.

121595501955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121595501955 is a deficient number, since it is larger than the sum of its proper divisors (75143289885).

121595501955 is an equidigital number, since it uses as much as digits as its factorization.

121595501955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91082870.

The product of its (nonzero) digits is 506250, while the sum is 48.

The spelling of 121595501955 in words is "one hundred twenty-one billion, five hundred ninety-five million, five hundred one thousand, nine hundred fifty-five".