21696781323 has 16 divisors (see below), whose sum is σ = 33063946496. Its totient is φ = 12397341600.

The previous prime is 21696781277. The next prime is 21696781339. The reversal of 21696781323 is 32318769612.

It is not a de Polignac number, because 21696781323 - 2²² = 21692587019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21696781343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452865 + ... + 498477.

It is an arithmetic number, because the mean of its divisors is an integer number (2066496656).

Almost surely, 2^21696781323 is an apocalyptic number.

21696781323 is a deficient number, since it is larger than the sum of its proper divisors (11367165173).

21696781323 is a wasteful number, since it uses less digits than its factorization.

21696781323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68274.

The product of its digits is 653184, while the sum is 48.

The spelling of 21696781323 in words is "twenty-one billion, six hundred ninety-six million, seven hundred eighty-one thousand, three hundred twenty-three".