21694735 has 8 divisors (see below), whose sum is σ = 26171136. Its totient is φ = 17264160.

The previous prime is 21694723. The next prime is 21694741. The reversal of 21694735 is 53749612.

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

It is a de Polignac number, because none of the positive numbers 2^k-21694735 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21694694 and 21694703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10404 + ... + 12313.

It is an arithmetic number, because the mean of its divisors is an integer number (3271392).

Almost surely, 2^21694735 is an apocalyptic number.

21694735 is a deficient number, since it is larger than the sum of its proper divisors (4476401).

21694735 is a wasteful number, since it uses less digits than its factorization.

21694735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22913.

The product of its digits is 45360, while the sum is 37.

The square root of 21694735 is about 4657.7607280752. The cubic root of 21694735 is about 278.9018852257.

The spelling of 21694735 in words is "twenty-one million, six hundred ninety-four thousand, seven hundred thirty-five".