21701704 has 8 divisors (see below), whose sum is σ = 40690710. Its totient is φ = 10850848.

The previous prime is 21701689. The next prime is 21701723. The reversal of 21701704 is 40710712.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 5299204 = 4050^2 + 2302^2 .

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, 1356349 + ... + 1356364.

Almost surely, 2^21701704 is an apocalyptic number.

It is an amenable number.

21701704 is a deficient number, since it is larger than the sum of its proper divisors (18989006).

21701704 is a wasteful number, since it uses less digits than its factorization.

21701704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712719 (or 2712715 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21701704 is about 4658.5087742753. The cubic root of 21701704 is about 278.9317459139.

The spelling of 21701704 in words is "twenty-one million, seven hundred one thousand, seven hundred four".