21944894 has 8 divisors (see below), whose sum is σ = 32937240. Its totient is φ = 10965816.

The previous prime is 21944887. The next prime is 21944899. The reversal of 21944894 is 49844912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4592 + ... + 8060.

It is an arithmetic number, because the mean of its divisors is an integer number (4117155).

Almost surely, 2^21944894 is an apocalyptic number.

21944894 is a deficient number, since it is larger than the sum of its proper divisors (10992346).

21944894 is a wasteful number, since it uses less digits than its factorization.

21944894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6634.

The product of its digits is 82944, while the sum is 41.

The square root of 21944894 is about 4684.5377573460. The cubic root of 21944894 is about 279.9697841544.

The spelling of 21944894 in words is "twenty-one million, nine hundred forty-four thousand, eight hundred ninety-four".