121521774085 has 16 divisors (see below), whose sum is σ = 152285552640. Its totient is φ = 92917756800.

The previous prime is 121521774079. The next prime is 121521774089. The reversal of 121521774085 is 580477125121.

It is a happy number.

It is not a de Polignac number, because 121521774085 - 2⁵ = 121521774053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121521774089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266016 + ... + 560185.

It is an arithmetic number, because the mean of its divisors is an integer number (9517847040).

Almost surely, 2^121521774085 is an apocalyptic number.

It is an amenable number.

121521774085 is a deficient number, since it is larger than the sum of its proper divisors (30763778555).

121521774085 is a wasteful number, since it uses less digits than its factorization.

121521774085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827508.

The product of its (nonzero) digits is 156800, while the sum is 43.

The spelling of 121521774085 in words is "one hundred twenty-one billion, five hundred twenty-one million, seven hundred seventy-four thousand, eighty-five".