121879913945 has 8 divisors (see below), whose sum is σ = 146356563336. Its totient is φ = 97436820096.

The previous prime is 121879913873. The next prime is 121879913963. The reversal of 121879913945 is 549319978121.

It can be written as a sum of positive squares in 4 ways, for example, as 31437772249 + 90442141696 = 177307^2 + 300736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121879913945 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8380892 + ... + 8395421.

It is an arithmetic number, because the mean of its divisors is an integer number (18294570417).

Almost surely, 2^121879913945 is an apocalyptic number.

It is an amenable number.

121879913945 is a deficient number, since it is larger than the sum of its proper divisors (24476649391).

121879913945 is a wasteful number, since it uses less digits than its factorization.

121879913945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16777771.

The product of its digits is 4898880, while the sum is 59.

The spelling of 121879913945 in words is "one hundred twenty-one billion, eight hundred seventy-nine million, nine hundred thirteen thousand, nine hundred forty-five".