21826964 has 12 divisors (see below), whose sum is σ = 38231424. Its totient is φ = 10903704.

The previous prime is 21826943. The next prime is 21826969. The reversal of 21826964 is 46962812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826969) by changing a digit.

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, 5309 + ... + 8475.

It is an arithmetic number, because the mean of its divisors is an integer number (3185952).

Almost surely, 2^21826964 is an apocalyptic number.

It is an amenable number.

21826964 is a deficient number, since it is larger than the sum of its proper divisors (16404460).

21826964 is a wasteful number, since it uses less digits than its factorization.

21826964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4894 (or 4892 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 21826964 is about 4671.9336467891. The cubic root of 21826964 is about 279.4673718076.

The spelling of 21826964 in words is "twenty-one million, eight hundred twenty-six thousand, nine hundred sixty-four".