121312799 has 4 divisors (see below), whose sum is σ = 128448864. Its totient is φ = 114176736.

The previous prime is 121312783. The next prime is 121312811. The reversal of 121312799 is 997213121.

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 121312799 - 2⁴ = 121312783 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 (121312729) 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, 3568007 + ... + 3568040.

It is an arithmetic number, because the mean of its divisors is an integer number (32112216).

Almost surely, 2^121312799 is an apocalyptic number.

121312799 is a deficient number, since it is larger than the sum of its proper divisors (7136065).

121312799 is an equidigital number, since it uses as much as digits as its factorization.

121312799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7136064.

The product of its digits is 6804, while the sum is 35.

The square root of 121312799 is about 11014.2089593397. The cubic root of 121312799 is about 495.0345845305.

The spelling of 121312799 in words is "one hundred twenty-one million, three hundred twelve thousand, seven hundred ninety-nine".