21466444 has 24 divisors (see below), whose sum is σ = 40234320. Its totient is φ = 9985536.

The previous prime is 21466441. The next prime is 21466457. The reversal of 21466444 is 44466412.

It is not an unprimeable number, because it can be changed into a prime (21466441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4279 + ... + 7825.

It is an arithmetic number, because the mean of its divisors is an integer number (1676430).

Almost surely, 2^21466444 is an apocalyptic number.

It is an amenable number.

21466444 is a deficient number, since it is larger than the sum of its proper divisors (18767876).

21466444 is a wasteful number, since it uses less digits than its factorization.

21466444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657 (or 3655 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 21466444 is about 4633.1893982439. The cubic root of 21466444 is about 277.9201502810.

The spelling of 21466444 in words is "twenty-one million, four hundred sixty-six thousand, four hundred forty-four".