121057665 has 16 divisors (see below), whose sum is σ = 197814528. Its totient is φ = 63190016.

The previous prime is 121057661. The next prime is 121057667. The reversal of 121057665 is 566750121.

It is a cyclic number.

It is not a de Polignac number, because 121057665 - 2² = 121057661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121057661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85152 + ... + 86561.

It is an arithmetic number, because the mean of its divisors is an integer number (12363408).

Almost surely, 2^121057665 is an apocalyptic number.

121057665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121057665 is a deficient number, since it is larger than the sum of its proper divisors (76756863).

121057665 is a wasteful number, since it uses less digits than its factorization.

121057665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171768.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 121057665 is about 11002.6208241491. The cubic root of 121057665 is about 494.6873037838.

The spelling of 121057665 in words is "one hundred twenty-one million, fifty-seven thousand, six hundred sixty-five".