21677257943 has 8 divisors (see below), whose sum is σ = 23657564160. Its totient is φ = 19698559480.

The previous prime is 21677257919. The next prime is 21677257961. The reversal of 21677257943 is 34975277612.

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

It is a cyclic number.

It is not a de Polignac number, because 21677257943 - 2¹⁰ = 21677256919 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 (21677257543) 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, 373655 + ... + 427752.

It is an arithmetic number, because the mean of its divisors is an integer number (2957195520).

Almost surely, 2^21677257943 is an apocalyptic number.

21677257943 is a deficient number, since it is larger than the sum of its proper divisors (1980306217).

21677257943 is a wasteful number, since it uses less digits than its factorization.

21677257943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803877.

The product of its digits is 4445280, while the sum is 53.

The spelling of 21677257943 in words is "twenty-one billion, six hundred seventy-seven million, two hundred fifty-seven thousand, nine hundred forty-three".