121185857 has 8 divisors (see below), whose sum is σ = 137376960. Its totient is φ = 105976080.

The previous prime is 121185839. The next prime is 121185887. The reversal of 121185857 is 758581121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121185857 - 2⁶ = 121185793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121185857.

It is not an unprimeable number, because it can be changed into a prime (121185817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245069 + ... + 245562.

It is an arithmetic number, because the mean of its divisors is an integer number (17172120).

Almost surely, 2^121185857 is an apocalyptic number.

It is an amenable number.

121185857 is a deficient number, since it is larger than the sum of its proper divisors (16191103).

121185857 is a wasteful number, since it uses less digits than its factorization.

121185857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490663.

The product of its digits is 22400, while the sum is 38.

The square root of 121185857 is about 11008.4448038767. Note that the first 3 decimals coincide. The cubic root of 121185857 is about 494.8618558149.

The spelling of 121185857 in words is "one hundred twenty-one million, one hundred eighty-five thousand, eight hundred fifty-seven".