921862123856 has 40 divisors (see below), whose sum is σ = 1810782150144. Its totient is φ = 454564949760.

The previous prime is 921862123843. The next prime is 921862123913. The reversal of 921862123856 is 658321268129.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 921862123798 and 921862123807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11419025 + ... + 11499471.

Almost surely, 2^921862123856 is an apocalyptic number.

It is an amenable number.

921862123856 is a deficient number, since it is larger than the sum of its proper divisors (888920026288).

921862123856 is a wasteful number, since it uses less digits than its factorization.

921862123856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90339 (or 90333 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 53.

The spelling of 921862123856 in words is "nine hundred twenty-one billion, eight hundred sixty-two million, one hundred twenty-three thousand, eight hundred fifty-six".