21325441 has 2 divisors, whose sum is σ = 21325442. Its totient is φ = 21325440.

The previous prime is 21325433. The next prime is 21325457. The reversal of 21325441 is 14452312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 4752400 = 4071^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 21325441 - 2³ = 21325433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21325471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662720 + 10662721.

It is an arithmetic number, because the mean of its divisors is an integer number (10662721).

Almost surely, 2^21325441 is an apocalyptic number.

It is an amenable number.

21325441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325441 is an equidigital number, since it uses as much as digits as its factorization.

21325441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 22.

The square root of 21325441 is about 4617.9477043379. The cubic root of 21325441 is about 277.3103040324.

Adding to 21325441 its reverse (14452312), we get a palindrome (35777753).

The spelling of 21325441 in words is "twenty-one million, three hundred twenty-five thousand, four hundred forty-one".