21726516464 has 10 divisors (see below), whose sum is σ = 42095125680. Its totient is φ = 10863258224.

The previous prime is 21726516463. The next prime is 21726516499. The reversal of 21726516464 is 46461562712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726516463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678953624 + ... + 678953655.

It is an arithmetic number, because the mean of its divisors is an integer number (4209512568).

Almost surely, 2^21726516464 is an apocalyptic number.

It is an amenable number.

21726516464 is a deficient number, since it is larger than the sum of its proper divisors (20368609216).

21726516464 is a wasteful number, since it uses less digits than its factorization.

21726516464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357907287 (or 1357907281 counting only the distinct ones).

The product of its digits is 483840, while the sum is 44.

The spelling of 21726516464 in words is "twenty-one billion, seven hundred twenty-six million, five hundred sixteen thousand, four hundred sixty-four".