21889814 has 8 divisors (see below), whose sum is σ = 32879520. Its totient is φ = 10929976.

The previous prime is 21889811. The next prime is 21889823. The reversal of 21889814 is 41898812.

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 (21889811) 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, 5534 + ... + 8625.

It is an arithmetic number, because the mean of its divisors is an integer number (4109940).

Almost surely, 2^21889814 is an apocalyptic number.

21889814 is a deficient number, since it is larger than the sum of its proper divisors (10989706).

21889814 is a wasteful number, since it uses less digits than its factorization.

21889814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934.

The product of its digits is 36864, while the sum is 41.

The square root of 21889814 is about 4678.6551486512. The cubic root of 21889814 is about 279.7353536858.

The spelling of 21889814 in words is "twenty-one million, eight hundred eighty-nine thousand, eight hundred fourteen".