121245665 has 16 divisors (see below), whose sum is σ = 153722880. Its totient is φ = 91654080.

The previous prime is 121245637. The next prime is 121245697. The reversal of 121245665 is 566542121.

It is not a de Polignac number, because 121245665 - 2⁸ = 121245409 is a prime.

It is a super-2 number, since 2×121245665² = 29401022562584450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2081 + ... + 15710.

It is an arithmetic number, because the mean of its divisors is an integer number (9607680).

Almost surely, 2^121245665 is an apocalyptic number.

It is an amenable number.

121245665 is a deficient number, since it is larger than the sum of its proper divisors (32477215).

121245665 is a wasteful number, since it uses less digits than its factorization.

121245665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17872.

The product of its digits is 14400, while the sum is 32.

The square root of 121245665 is about 11011.1609288031. The cubic root of 121245665 is about 494.9432509850.

Adding to 121245665 its reverse (566542121), we get a palindrome (687787786).

The spelling of 121245665 in words is "one hundred twenty-one million, two hundred forty-five thousand, six hundred sixty-five".