21694268 has 6 divisors (see below), whose sum is σ = 37964976. Its totient is φ = 10847132.

The previous prime is 21694249. The next prime is 21694271. The reversal of 21694268 is 86249612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2711780 + ... + 2711787.

It is an arithmetic number, because the mean of its divisors is an integer number (6327496).

Almost surely, 2^21694268 is an apocalyptic number.

It is an amenable number.

21694268 is a deficient number, since it is larger than the sum of its proper divisors (16270708).

21694268 is a wasteful number, since it uses less digits than its factorization.

21694268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5423571 (or 5423569 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 21694268 is about 4657.7105964197. The cubic root of 21694268 is about 278.8998840010.

The spelling of 21694268 in words is "twenty-one million, six hundred ninety-four thousand, two hundred sixty-eight".