21965444 has 12 divisors (see below), whose sum is σ = 40462800. Its totient is φ = 10404648.

The previous prime is 21965443. The next prime is 21965459. The reversal of 21965444 is 44456912.

It is not an unprimeable number, because it can be changed into a prime (21965443) 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, 144434 + ... + 144585.

It is an arithmetic number, because the mean of its divisors is an integer number (3371900).

Almost surely, 2^21965444 is an apocalyptic number.

It is an amenable number.

21965444 is a deficient number, since it is larger than the sum of its proper divisors (18497356).

21965444 is a wasteful number, since it uses less digits than its factorization.

21965444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289042 (or 289040 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21965444 is about 4686.7306301941. The cubic root of 21965444 is about 280.0571481992.

The spelling of 21965444 in words is "twenty-one million, nine hundred sixty-five thousand, four hundred forty-four".