121679975321 has 8 divisors (see below), whose sum is σ = 123478533864. Its totient is φ = 119884976640.

The previous prime is 121679975309. The next prime is 121679975377. The reversal of 121679975321 is 123579976121.

It can be written as a sum of positive squares in 4 ways, for example, as 1932833296 + 119747142025 = 43964^2 + 346045^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121679975321 - 2⁶ = 121679975257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121679975381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821060 + ... + 957861.

It is an arithmetic number, because the mean of its divisors is an integer number (15434816733).

Almost surely, 2^121679975321 is an apocalyptic number.

It is an amenable number.

121679975321 is a deficient number, since it is larger than the sum of its proper divisors (1798558543).

121679975321 is an equidigital number, since it uses as much as digits as its factorization.

121679975321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779931.

The product of its digits is 1428840, while the sum is 53.

The spelling of 121679975321 in words is "one hundred twenty-one billion, six hundred seventy-nine million, nine hundred seventy-five thousand, three hundred twenty-one".