21446441 has 12 divisors (see below), whose sum is σ = 22393284. Its totient is φ = 20532000.

The previous prime is 21446437. The next prime is 21446443. The reversal of 21446441 is 14464412.

It can be written as a sum of positive squares in 2 ways, for example, as 10530025 + 10916416 = 3245^2 + 3304^2 .

It is not a de Polignac number, because 21446441 - 2² = 21446437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21446441.

It is not an unprimeable number, because it can be changed into a prime (21446443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212291 + ... + 212391.

It is an arithmetic number, because the mean of its divisors is an integer number (1866107).

Almost surely, 2^21446441 is an apocalyptic number.

It is an amenable number.

21446441 is a deficient number, since it is larger than the sum of its proper divisors (946843).

21446441 is an equidigital number, since it uses as much as digits as its factorization.

21446441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 221 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 21446441 is about 4631.0302309529. The cubic root of 21446441 is about 277.8337990063.

The spelling of 21446441 in words is "twenty-one million, four hundred forty-six thousand, four hundred forty-one".