121857057 has 24 divisors (see below), whose sum is σ = 203052096. Its totient is φ = 68978016.

The previous prime is 121857049. The next prime is 121857067. The reversal of 121857057 is 750758121.

It is not a de Polignac number, because 121857057 - 2³ = 121857049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121857067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2298 + ... + 15779.

It is an arithmetic number, because the mean of its divisors is an integer number (8460504).

Almost surely, 2^121857057 is an apocalyptic number.

It is an amenable number.

121857057 is a deficient number, since it is larger than the sum of its proper divisors (81195039).

121857057 is a wasteful number, since it uses less digits than its factorization.

121857057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18197 (or 18194 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 121857057 is about 11038.8883951238. Note that the first 3 decimals coincide. The cubic root of 121857057 is about 495.7737882468.

The spelling of 121857057 in words is "one hundred twenty-one million, eight hundred fifty-seven thousand, fifty-seven".