21676979583 has 24 divisors (see below), whose sum is σ = 35910695808. Its totient is φ = 12343065552.

The previous prime is 21676979503. The next prime is 21676979689. The reversal of 21676979583 is 38597967612.

It is not a de Polignac number, because 21676979583 - 2¹⁷ = 21676848511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 21676979583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676979503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 590085 + ... + 625742.

It is an arithmetic number, because the mean of its divisors is an integer number (1496278992).

Almost surely, 2^21676979583 is an apocalyptic number.

21676979583 is a deficient number, since it is larger than the sum of its proper divisors (14233716225).

21676979583 is a wasteful number, since it uses less digits than its factorization.

21676979583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216123 (or 1216120 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 21676979583 in words is "twenty-one billion, six hundred seventy-six million, nine hundred seventy-nine thousand, five hundred eighty-three".