121573928813 has 4 divisors (see below), whose sum is σ = 121821534048. Its totient is φ = 121326323580.

The previous prime is 121573928797. The next prime is 121573928821. The reversal of 121573928813 is 318829375121.

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 121573928813 - 2⁴ = 121573928797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121573921813) 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, 123801881 + ... + 123802862.

It is an arithmetic number, because the mean of its divisors is an integer number (30455383512).

Almost surely, 2^121573928813 is an apocalyptic number.

It is an amenable number.

121573928813 is a deficient number, since it is larger than the sum of its proper divisors (247605235).

121573928813 is an equidigital number, since it uses as much as digits as its factorization.

121573928813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247605234.

The product of its digits is 725760, while the sum is 50.

The spelling of 121573928813 in words is "one hundred twenty-one billion, five hundred seventy-three million, nine hundred twenty-eight thousand, eight hundred thirteen".