21445610344 has 8 divisors (see below), whose sum is σ = 40210519410. Its totient is φ = 10722805168.

The previous prime is 21445610317. The next prime is 21445610353. The reversal of 21445610344 is 44301654412.

It can be written as a sum of positive squares in only one way, i.e., 20877360100 + 568250244 = 144490^2 + 23838^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340350639 + ... + 1340350654.

Almost surely, 2^21445610344 is an apocalyptic number.

It is an amenable number.

21445610344 is a deficient number, since it is larger than the sum of its proper divisors (18764909066).

21445610344 is a wasteful number, since it uses less digits than its factorization.

21445610344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680701299 (or 2680701295 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 21445610344 in words is "twenty-one billion, four hundred forty-five million, six hundred ten thousand, three hundred forty-four".