21923894 has 8 divisors (see below), whose sum is σ = 33650760. Its totient is φ = 10706976.

The previous prime is 21923833. The next prime is 21923903. The reversal of 21923894 is 49832912.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127379 + ... + 127550.

It is an arithmetic number, because the mean of its divisors is an integer number (4206345).

Almost surely, 2^21923894 is an apocalyptic number.

21923894 is a deficient number, since it is larger than the sum of its proper divisors (11726866).

21923894 is a wasteful number, since it uses less digits than its factorization.

21923894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254974.

The product of its digits is 31104, while the sum is 38.

The square root of 21923894 is about 4682.2958044105. The cubic root of 21923894 is about 279.8804506649.

The spelling of 21923894 in words is "twenty-one million, nine hundred twenty-three thousand, eight hundred ninety-four".