21916846 has 8 divisors (see below), whose sum is σ = 37571760. Its totient is φ = 9392928.

The previous prime is 21916793. The next prime is 21916847. The reversal of 21916846 is 64861912.

It is a happy number.

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 (21916847) 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, 782731 + ... + 782758.

It is an arithmetic number, because the mean of its divisors is an integer number (4696470).

Almost surely, 2^21916846 is an apocalyptic number.

21916846 is a deficient number, since it is larger than the sum of its proper divisors (15654914).

21916846 is a wasteful number, since it uses less digits than its factorization.

21916846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565498.

The product of its digits is 20736, while the sum is 37.

The square root of 21916846 is about 4681.5431216641. The cubic root of 21916846 is about 279.8504558590.

The spelling of 21916846 in words is "twenty-one million, nine hundred sixteen thousand, eight hundred forty-six".