21226600664 has 8 divisors (see below), whose sum is σ = 39799876260. Its totient is φ = 10613300328.

The previous prime is 21226600657. The next prime is 21226600699. The reversal of 21226600664 is 46600662212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326662534 + ... + 1326662549.

Almost surely, 2^21226600664 is an apocalyptic number.

It is an amenable number.

21226600664 is a deficient number, since it is larger than the sum of its proper divisors (18573275596).

21226600664 is a wasteful number, since it uses less digits than its factorization.

21226600664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653325089 (or 2653325085 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 21226600664 in words is "twenty-one billion, two hundred twenty-six million, six hundred thousand, six hundred sixty-four".