121813399 has 4 divisors (see below), whose sum is σ = 121931680. Its totient is φ = 121695120.

The previous prime is 121813397. The next prime is 121813411. The reversal of 121813399 is 993318121.

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 121813399 - 2¹ = 121813397 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 (121813397) 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, 57582 + ... + 59659.

It is an arithmetic number, because the mean of its divisors is an integer number (30482920).

Almost surely, 2^121813399 is an apocalyptic number.

121813399 is a deficient number, since it is larger than the sum of its proper divisors (118281).

121813399 is a wasteful number, since it uses less digits than its factorization.

121813399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118280.

The product of its digits is 11664, while the sum is 37.

The square root of 121813399 is about 11036.9107543733. The cubic root of 121813399 is about 495.7145738471.

The spelling of 121813399 in words is "one hundred twenty-one million, eight hundred thirteen thousand, three hundred ninety-nine".