857461221 has 12 divisors (see below), whose sum is σ = 1284427872. Its totient is φ = 571640652.

The previous prime is 857461211. The next prime is 857461223. The reversal of 857461221 is 122164758.

857461221 is a `hidden beast` number, since 8 + 574 + 61 + 2 + 21 = 666.

It is not a de Polignac number, because 857461221 - 2¹⁴ = 857444837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857461223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1764081 + ... + 1764566.

It is an arithmetic number, because the mean of its divisors is an integer number (107035656).

Almost surely, 2^857461221 is an apocalyptic number.

857461221 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

857461221 is a deficient number, since it is larger than the sum of its proper divisors (426966651).

857461221 is an equidigital number, since it uses as much as digits as its factorization.

857461221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528662 (or 3528650 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 857461221 is about 29282.4387816316. The cubic root of 857461221 is about 950.0318441773.

The spelling of 857461221 in words is "eight hundred fifty-seven million, four hundred sixty-one thousand, two hundred twenty-one".