21695368 has 8 divisors (see below), whose sum is σ = 40678830. Its totient is φ = 10847680.

The previous prime is 21695353. The next prime is 21695389. The reversal of 21695368 is 86359612.

It can be written as a sum of positive squares in only one way, i.e., 12945604 + 8749764 = 3598^2 + 2958^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21695368.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1355953 + ... + 1355968.

Almost surely, 2^21695368 is an apocalyptic number.

It is an amenable number.

21695368 is a deficient number, since it is larger than the sum of its proper divisors (18983462).

21695368 is a wasteful number, since it uses less digits than its factorization.

21695368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711927 (or 2711923 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 21695368 is about 4657.8286786871. The cubic root of 21695368 is about 278.9045977606.

The spelling of 21695368 in words is "twenty-one million, six hundred ninety-five thousand, three hundred sixty-eight".