21694323 has 8 divisors (see below), whose sum is σ = 33058048. Its totient is φ = 12396744.

The previous prime is 21694303. The next prime is 21694367. The reversal of 21694323 is 32349612.

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

It is not a de Polignac number, because 21694323 - 2⁹ = 21693811 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21694303) 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 7 ways as a sum of consecutive naturals, for example, 516511 + ... + 516552.

It is an arithmetic number, because the mean of its divisors is an integer number (4132256).

Almost surely, 2^21694323 is an apocalyptic number.

21694323 is a deficient number, since it is larger than the sum of its proper divisors (11363725).

21694323 is a wasteful number, since it uses less digits than its factorization.

21694323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033073.

The product of its digits is 7776, while the sum is 30.

The square root of 21694323 is about 4657.7165006041. The cubic root of 21694323 is about 278.9001196928.

The spelling of 21694323 in words is "twenty-one million, six hundred ninety-four thousand, three hundred twenty-three".