21694382 has 8 divisors (see below), whose sum is σ = 33956496. Its totient is φ = 10375552.

The previous prime is 21694381. The next prime is 21694391. The reversal of 21694382 is 28349612.

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

It is a super-3 number, since 3×21694382³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694381) 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, 235763 + ... + 235854.

It is an arithmetic number, because the mean of its divisors is an integer number (4244562).

Almost surely, 2^21694382 is an apocalyptic number.

21694382 is a deficient number, since it is larger than the sum of its proper divisors (12262114).

21694382 is a wasteful number, since it uses less digits than its factorization.

21694382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471642.

The product of its digits is 20736, while the sum is 35.

The square root of 21694382 is about 4657.7228341755. The cubic root of 21694382 is about 278.9003725253.

The spelling of 21694382 in words is "twenty-one million, six hundred ninety-four thousand, three hundred eighty-two".