21689294 has 8 divisors (see below), whose sum is σ = 35491608. Its totient is φ = 9858760.

The previous prime is 21689273. The next prime is 21689309. The reversal of 21689294 is 49298612.

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

It is a Curzon number.

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, 492917 + ... + 492960.

It is an arithmetic number, because the mean of its divisors is an integer number (4436451).

Almost surely, 2^21689294 is an apocalyptic number.

21689294 is a deficient number, since it is larger than the sum of its proper divisors (13802314).

21689294 is a wasteful number, since it uses less digits than its factorization.

21689294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985890.

The product of its digits is 62208, while the sum is 41.

The square root of 21689294 is about 4657.1766124982. The cubic root of 21689294 is about 278.8785672480.

The spelling of 21689294 in words is "twenty-one million, six hundred eighty-nine thousand, two hundred ninety-four".