21707065444 has 12 divisors (see below), whose sum is σ = 38017787500. Its totient is φ = 10844840448.

The previous prime is 21707065439. The next prime is 21707065459. The reversal of 21707065444 is 44456070712.

It can be written as a sum of positive squares in 2 ways, for example, as 10062497344 + 11644568100 = 100312^2 + 107910^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21707065397 and 21707065406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167449 + ... + 2177440.

Almost surely, 2^21707065444 is an apocalyptic number.

It is an amenable number.

21707065444 is a deficient number, since it is larger than the sum of its proper divisors (16310722056).

21707065444 is a wasteful number, since it uses less digits than its factorization.

21707065444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346142 (or 4346140 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 40.

The spelling of 21707065444 in words is "twenty-one billion, seven hundred seven million, sixty-five thousand, four hundred forty-four".