21694366 has 8 divisors (see below), whose sum is σ = 32564520. Its totient is φ = 10839528.

The previous prime is 21694303. The next prime is 21694367. The reversal of 21694366 is 66349612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21694366² = 941291032283912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865 + ... + 6643.

It is an arithmetic number, because the mean of its divisors is an integer number (4070565).

Almost surely, 2^21694366 is an apocalyptic number.

21694366 is a deficient number, since it is larger than the sum of its proper divisors (10870154).

21694366 is a wasteful number, since it uses less digits than its factorization.

21694366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7658.

The product of its digits is 46656, while the sum is 37.

The square root of 21694366 is about 4657.7211165977. The cubic root of 21694366 is about 278.9003039606.

The spelling of 21694366 in words is "twenty-one million, six hundred ninety-four thousand, three hundred sixty-six".