21996737679 has 16 divisors (see below), whose sum is σ = 33562225152. Its totient is φ = 12553294368.

The previous prime is 21996737663. The next prime is 21996737681. The reversal of 21996737679 is 97673769912.

It is not a de Polignac number, because 21996737679 - 2⁴ = 21996737663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996737179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661299 + ... + 693764.

It is an arithmetic number, because the mean of its divisors is an integer number (2097639072).

Almost surely, 2^21996737679 is an apocalyptic number.

21996737679 is a deficient number, since it is larger than the sum of its proper divisors (11565487473).

21996737679 is a wasteful number, since it uses less digits than its factorization.

21996737679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355846.

The product of its digits is 54010152, while the sum is 66.

The spelling of 21996737679 in words is "twenty-one billion, nine hundred ninety-six million, seven hundred thirty-seven thousand, six hundred seventy-nine".