861057457421 has 8 divisors (see below), whose sum is σ = 984081833280. Its totient is φ = 738037123488.

The previous prime is 861057457397. The next prime is 861057457471. The reversal of 861057457421 is 124754750168.

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

It is not a de Polignac number, because 861057457421 - 2¹⁸ = 861057195277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861057457421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861057457471) 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, 539336 + ... + 1418801.

It is an arithmetic number, because the mean of its divisors is an integer number (123010229160).

Almost surely, 2^861057457421 is an apocalyptic number.

It is an amenable number.

861057457421 is a deficient number, since it is larger than the sum of its proper divisors (123024375859).

861057457421 is a wasteful number, since it uses less digits than its factorization.

861057457421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020963.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 861057457421 in words is "eight hundred sixty-one billion, fifty-seven million, four hundred fifty-seven thousand, four hundred twenty-one".