421252857 has 12 divisors (see below), whose sum is σ = 640501680. Its totient is φ = 266054328.

The previous prime is 421252847. The next prime is 421252873. The reversal of 421252857 is 758252124.

It is a happy number.

It is not a de Polignac number, because 421252857 - 2⁴ = 421252841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421252837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1231563 + ... + 1231904.

It is an arithmetic number, because the mean of its divisors is an integer number (53375140).

Almost surely, 2^421252857 is an apocalyptic number.

It is an amenable number.

421252857 is a deficient number, since it is larger than the sum of its proper divisors (219248823).

421252857 is a wasteful number, since it uses less digits than its factorization.

421252857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463492 (or 2463489 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 421252857 is about 20524.4453518238. The cubic root of 421252857 is about 749.6311412874.

The spelling of 421252857 in words is "four hundred twenty-one million, two hundred fifty-two thousand, eight hundred fifty-seven".