121399361 has 4 divisors (see below), whose sum is σ = 121447872. Its totient is φ = 121350852.

The previous prime is 121399357. The next prime is 121399367. The reversal of 121399361 is 163993121.

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 121399361 - 2² = 121399357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121399367) 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, 20285 + ... + 25578.

It is an arithmetic number, because the mean of its divisors is an integer number (30361968).

Almost surely, 2^121399361 is an apocalyptic number.

It is an amenable number.

121399361 is a deficient number, since it is larger than the sum of its proper divisors (48511).

121399361 is an equidigital number, since it uses as much as digits as its factorization.

121399361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48510.

The product of its digits is 8748, while the sum is 35.

The square root of 121399361 is about 11018.1378190691. The cubic root of 121399361 is about 495.1522994955.

The spelling of 121399361 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, three hundred sixty-one".