21694616 has 8 divisors (see below), whose sum is σ = 40677420. Its totient is φ = 10847304.

The previous prime is 21694613. The next prime is 21694627. The reversal of 21694616 is 61649612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1355906 + ... + 1355921.

Almost surely, 2^21694616 is an apocalyptic number.

It is an amenable number.

21694616 is a deficient number, since it is larger than the sum of its proper divisors (18982804).

21694616 is a wasteful number, since it uses less digits than its factorization.

21694616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711833 (or 2711829 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 21694616 is about 4657.7479536789. The cubic root of 21694616 is about 278.9013752804.

The spelling of 21694616 in words is "twenty-one million, six hundred ninety-four thousand, six hundred sixteen".