21679697612 has 12 divisors (see below), whose sum is σ = 38365757640. Its totient is φ = 10718052576.

The previous prime is 21679697597. The next prime is 21679697617.

21679697612 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21679697617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30448658 + ... + 30449369.

It is an arithmetic number, because the mean of its divisors is an integer number (3197146470).

Almost surely, 2^21679697612 is an apocalyptic number.

It is an amenable number.

21679697612 is a deficient number, since it is larger than the sum of its proper divisors (16686060028).

21679697612 is a wasteful number, since it uses less digits than its factorization.

21679697612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60898120 (or 60898118 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 56.

The spelling of 21679697612 in words is "twenty-one billion, six hundred seventy-nine million, six hundred ninety-seven thousand, six hundred twelve".