121865699 has 4 divisors (see below), whose sum is σ = 121908864. Its totient is φ = 121822536.

The previous prime is 121865693. The next prime is 121865701. The reversal of 121865699 is 996568121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996568121 = 20641 ⋅48281.

It is a cyclic number.

It is not a de Polignac number, because 121865699 - 2¹² = 121861603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121865693) 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, 17027 + ... + 23100.

It is an arithmetic number, because the mean of its divisors is an integer number (30477216).

Almost surely, 2^121865699 is an apocalyptic number.

121865699 is a deficient number, since it is larger than the sum of its proper divisors (43165).

121865699 is an equidigital number, since it uses as much as digits as its factorization.

121865699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43164.

The product of its digits is 233280, while the sum is 47.

The square root of 121865699 is about 11039.2798225247. The cubic root of 121865699 is about 495.7855079232.

The spelling of 121865699 in words is "one hundred twenty-one million, eight hundred sixty-five thousand, six hundred ninety-nine".