21344894 has 8 divisors (see below), whose sum is σ = 33900768. Its totient is φ = 10044640.

The previous prime is 21344857. The next prime is 21344903. The reversal of 21344894 is 49844312.

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

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, 313862 + ... + 313929.

It is an arithmetic number, because the mean of its divisors is an integer number (4237596).

Almost surely, 2^21344894 is an apocalyptic number.

21344894 is a deficient number, since it is larger than the sum of its proper divisors (12555874).

21344894 is a wasteful number, since it uses less digits than its factorization.

21344894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627810.

The product of its digits is 27648, while the sum is 35.

The square root of 21344894 is about 4620.0534628941. The cubic root of 21344894 is about 277.3945989345.

The spelling of 21344894 in words is "twenty-one million, three hundred forty-four thousand, eight hundred ninety-four".