21233441 has 2 divisors, whose sum is σ = 21233442. Its totient is φ = 21233440.

The previous prime is 21233413. The next prime is 21233453. The reversal of 21233441 is 14433212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 73441 = 4600^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233441 - 2¹⁸ = 20971297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21233411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616720 + 10616721.

It is an arithmetic number, because the mean of its divisors is an integer number (10616721).

Almost surely, 2^21233441 is an apocalyptic number.

It is an amenable number.

21233441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233441 is an equidigital number, since it uses as much as digits as its factorization.

21233441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 20.

The square root of 21233441 is about 4607.9758028879. The cubic root of 21233441 is about 276.9109481017.

Adding to 21233441 its reverse (14433212), we get a palindrome (35666653).

The spelling of 21233441 in words is "twenty-one million, two hundred thirty-three thousand, four hundred forty-one".