21679831823 has 8 divisors (see below), whose sum is σ = 23504208000. Its totient is φ = 19877840928.

The previous prime is 21679831787. The next prime is 21679831897. The reversal of 21679831823 is 32813897612.

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 21679831823 - 2⁸ = 21679831567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21679834823) 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, 5594303 + ... + 5598176.

It is an arithmetic number, because the mean of its divisors is an integer number (2938026000).

Almost surely, 2^21679831823 is an apocalyptic number.

21679831823 is a deficient number, since it is larger than the sum of its proper divisors (1824376177).

21679831823 is a wasteful number, since it uses less digits than its factorization.

21679831823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11192641.

The product of its digits is 870912, while the sum is 50.

The spelling of 21679831823 in words is "twenty-one billion, six hundred seventy-nine million, eight hundred thirty-one thousand, eight hundred twenty-three".