21946910 has 16 divisors (see below), whose sum is σ = 40867200. Its totient is φ = 8475936.

The previous prime is 21946909. The next prime is 21946937. The reversal of 21946910 is 1964912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37550 + ... + 38129.

It is an arithmetic number, because the mean of its divisors is an integer number (2554200).

Almost surely, 2^21946910 is an apocalyptic number.

21946910 is a deficient number, since it is larger than the sum of its proper divisors (18920290).

21946910 is a wasteful number, since it uses less digits than its factorization.

21946910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75715.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21946910 is about 4684.7529283837. The cubic root of 21946910 is about 279.9783571707.

The spelling of 21946910 in words is "twenty-one million, nine hundred forty-six thousand, nine hundred ten".