21694328 has 16 divisors (see below), whose sum is σ = 40771680. Its totient is φ = 10821888.

The previous prime is 21694303. The next prime is 21694367. The reversal of 21694328 is 82349612.

It is a congruent number.

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, 776 + ... + 6632.

It is an arithmetic number, because the mean of its divisors is an integer number (2548230).

Almost surely, 2^21694328 is an apocalyptic number.

It is an amenable number.

21694328 is a deficient number, since it is larger than the sum of its proper divisors (19077352).

21694328 is a wasteful number, since it uses less digits than its factorization.

21694328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6326 (or 6322 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21694328 is about 4657.7170373478. The cubic root of 21694328 is about 278.9001411193.

It can be divided in two parts, 21694 and 328, that added together give a palindrome (22022).

The spelling of 21694328 in words is "twenty-one million, six hundred ninety-four thousand, three hundred twenty-eight".