21446944 has 12 divisors (see below), whose sum is σ = 42223734. Its totient is φ = 10723456.

The previous prime is 21446941. The next prime is 21446963. The reversal of 21446944 is 44964412.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 176400 = 4612^2 + 420^2 .

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21446941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335077 + ... + 335140.

Almost surely, 2^21446944 is an apocalyptic number.

It is an amenable number.

21446944 is a deficient number, since it is larger than the sum of its proper divisors (20776790).

21446944 is an equidigital number, since it uses as much as digits as its factorization.

21446944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670227 (or 670219 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 21446944 is about 4631.0845382048. The cubic root of 21446944 is about 277.8359710731.

The spelling of 21446944 in words is "twenty-one million, four hundred forty-six thousand, nine hundred forty-four".