21694606 has 8 divisors (see below), whose sum is σ = 33591744. Its totient is φ = 10497360.

The previous prime is 21694583. The next prime is 21694609. The reversal of 21694606 is 60649612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174895 + ... + 175018.

It is an arithmetic number, because the mean of its divisors is an integer number (4198968).

Almost surely, 2^21694606 is an apocalyptic number.

21694606 is a deficient number, since it is larger than the sum of its proper divisors (11897138).

21694606 is a wasteful number, since it uses less digits than its factorization.

21694606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349946.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 21694606 is about 4657.7468801986. The cubic root of 21694606 is about 278.9013324277.

The spelling of 21694606 in words is "twenty-one million, six hundred ninety-four thousand, six hundred six".