121652399 has 4 divisors (see below), whose sum is σ = 132711720. Its totient is φ = 110593080.

The previous prime is 121652387. The next prime is 121652407. The reversal of 121652399 is 993256121.

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 121652399 - 2²⁰ = 120603823 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 (121652599) 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, 5529644 + ... + 5529665.

It is an arithmetic number, because the mean of its divisors is an integer number (33177930).

Almost surely, 2^121652399 is an apocalyptic number.

121652399 is a deficient number, since it is larger than the sum of its proper divisors (11059321).

121652399 is a wasteful number, since it uses less digits than its factorization.

121652399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11059320.

The product of its digits is 29160, while the sum is 38.

The square root of 121652399 is about 11029.6146351539. The cubic root of 121652399 is about 495.4960832860.

The spelling of 121652399 in words is "one hundred twenty-one million, six hundred fifty-two thousand, three hundred ninety-nine".