21461441 has 2 divisors, whose sum is σ = 21461442. Its totient is φ = 21461440.

The previous prime is 21461437. The next prime is 21461467. The reversal of 21461441 is 14416412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21298225 + 163216 = 4615^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 21461441 - 2² = 21461437 is a prime.

It is not a weakly prime, because it can be changed into another prime (21461941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730720 + 10730721.

It is an arithmetic number, because the mean of its divisors is an integer number (10730721).

Almost surely, 2^21461441 is an apocalyptic number.

It is an amenable number.

21461441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21461441 is an equidigital number, since it uses as much as digits as its factorization.

21461441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 21461441 is about 4632.6494579236. The cubic root of 21461441 is about 277.8985577815.

Adding to 21461441 its reverse (14416412), we get a palindrome (35877853).

The spelling of 21461441 in words is "twenty-one million, four hundred sixty-one thousand, four hundred forty-one".