121739893693 has 4 divisors (see below), whose sum is σ = 132807156768. Its totient is φ = 110672630620.

The previous prime is 121739893669. The next prime is 121739893697. The reversal of 121739893693 is 396398937121.

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 a de Polignac number, because none of the positive numbers 2^k-121739893693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121739893697) 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, 5533631521 + ... + 5533631542.

It is an arithmetic number, because the mean of its divisors is an integer number (33201789192).

Almost surely, 2^121739893693 is an apocalyptic number.

It is an amenable number.

121739893693 is a deficient number, since it is larger than the sum of its proper divisors (11067263075).

121739893693 is a wasteful number, since it uses less digits than its factorization.

121739893693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11067263074.

The product of its digits is 13226976, while the sum is 61.

The spelling of 121739893693 in words is "one hundred twenty-one billion, seven hundred thirty-nine million, eight hundred ninety-three thousand, six hundred ninety-three".