21446489 has 2 divisors, whose sum is σ = 21446490. Its totient is φ = 21446488.

The previous prime is 21446471. The next prime is 21446501. The reversal of 21446489 is 98464412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 1420864 = 4475^2 + 1192^2 .

It is a cyclic number.

It is not a de Polignac number, because 21446489 - 2⁸ = 21446233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21446989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723244 + 10723245.

It is an arithmetic number, because the mean of its divisors is an integer number (10723245).

Almost surely, 2^21446489 is an apocalyptic number.

It is an amenable number.

21446489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21446489 is an equidigital number, since it uses as much as digits as its factorization.

21446489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The square root of 21446489 is about 4631.0354133822. The cubic root of 21446489 is about 277.8340062825.

The spelling of 21446489 in words is "twenty-one million, four hundred forty-six thousand, four hundred eighty-nine".