121338399 has 16 divisors (see below), whose sum is σ = 199119872. Its totient is φ = 64002528.

The previous prime is 121338331. The next prime is 121338403. The reversal of 121338399 is 993833121.

It is not a de Polignac number, because 121338399 - 2¹² = 121334303 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121336399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221959 + ... + 222504.

It is an arithmetic number, because the mean of its divisors is an integer number (12444992).

Almost surely, 2^121338399 is an apocalyptic number.

121338399 is a deficient number, since it is larger than the sum of its proper divisors (77781473).

121338399 is a wasteful number, since it uses less digits than its factorization.

121338399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444486.

The product of its digits is 34992, while the sum is 39.

The square root of 121338399 is about 11015.3710332426. The cubic root of 121338399 is about 495.0694035937.

The spelling of 121338399 in words is "one hundred twenty-one million, three hundred thirty-eight thousand, three hundred ninety-nine".