21723334 has 8 divisors (see below), whose sum is σ = 32641200. Its totient is φ = 10842936.

The previous prime is 21723323. The next prime is 21723347. The reversal of 21723334 is 43332712.

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

It is a junction number, because it is equal to n+sod(n) for n = 21723299 and 21723308.

It is a congruent number.

It is an unprimeable number.

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, 7869 + ... + 10264.

It is an arithmetic number, because the mean of its divisors is an integer number (4080150).

Almost surely, 2^21723334 is an apocalyptic number.

21723334 is a deficient number, since it is larger than the sum of its proper divisors (10917866).

21723334 is a wasteful number, since it uses less digits than its factorization.

21723334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18734.

The product of its digits is 3024, while the sum is 25.

The square root of 21723334 is about 4660.8297544536. The cubic root of 21723334 is about 279.0243851881.

The spelling of 21723334 in words is "twenty-one million, seven hundred twenty-three thousand, three hundred thirty-four".