857297235421 has 4 divisors (see below), whose sum is σ = 935233347744. Its totient is φ = 779361123100.

The previous prime is 857297235401. The next prime is 857297235463. The reversal of 857297235421 is 124532792758.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 857297235421 - 2¹⁵ = 857297202653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857297235401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38968056145 + ... + 38968056166.

It is an arithmetic number, because the mean of its divisors is an integer number (233808336936).

Almost surely, 2^857297235421 is an apocalyptic number.

It is an amenable number.

857297235421 is a deficient number, since it is larger than the sum of its proper divisors (77936112323).

857297235421 is a wasteful number, since it uses less digits than its factorization.

857297235421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77936112322.

The product of its digits is 8467200, while the sum is 55.

The spelling of 857297235421 in words is "eight hundred fifty-seven billion, two hundred ninety-seven million, two hundred thirty-five thousand, four hundred twenty-one".