21979363967 has 8 divisors (see below), whose sum is σ = 23982712320. Its totient is φ = 19976886360.

The previous prime is 21979363853. The next prime is 21979363979. The reversal of 21979363967 is 76936397912.

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 21979363967 - 2⁸ = 21979363711 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 (21979360967) 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, 164333 + ... + 266390.

It is an arithmetic number, because the mean of its divisors is an integer number (2997839040).

Almost surely, 2^21979363967 is an apocalyptic number.

21979363967 is a deficient number, since it is larger than the sum of its proper divisors (2003348353).

21979363967 is a wasteful number, since it uses less digits than its factorization.

21979363967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435373.

The product of its digits is 23147208, while the sum is 62.

The spelling of 21979363967 in words is "twenty-one billion, nine hundred seventy-nine million, three hundred sixty-three thousand, nine hundred sixty-seven".