121665323 has 4 divisors (see below), whose sum is σ = 131024208. Its totient is φ = 112306440.

The previous prime is 121665317. The next prime is 121665337. The reversal of 121665323 is 323566121.

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 121665323 - 2⁸ = 121665067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121665023) 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, 4679423 + ... + 4679448.

It is an arithmetic number, because the mean of its divisors is an integer number (32756052).

Almost surely, 2^121665323 is an apocalyptic number.

121665323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121665323 is a deficient number, since it is larger than the sum of its proper divisors (9358885).

121665323 is an equidigital number, since it uses as much as digits as its factorization.

121665323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9358884.

The product of its digits is 6480, while the sum is 29.

The square root of 121665323 is about 11030.2004968178. The cubic root of 121665323 is about 495.5136293563.

The spelling of 121665323 in words is "one hundred twenty-one million, six hundred sixty-five thousand, three hundred twenty-three".