121373979 has 4 divisors (see below), whose sum is σ = 161831976. Its totient is φ = 80915984.

The previous prime is 121373977. The next prime is 121373983. The reversal of 121373979 is 979373121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121373979 - 2¹ = 121373977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121373979.

It is not an unprimeable number, because it can be changed into a prime (121373977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20228994 + ... + 20228999.

It is an arithmetic number, because the mean of its divisors is an integer number (40457994).

Almost surely, 2^121373979 is an apocalyptic number.

121373979 is a deficient number, since it is larger than the sum of its proper divisors (40457997).

121373979 is an equidigital number, since it uses as much as digits as its factorization.

121373979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40457996.

The product of its digits is 71442, while the sum is 42.

The square root of 121373979 is about 11016.9859308252. The cubic root of 121373979 is about 495.1177885186.

The spelling of 121373979 in words is "one hundred twenty-one million, three hundred seventy-three thousand, nine hundred seventy-nine".