21441337 has 2 divisors, whose sum is σ = 21441338. Its totient is φ = 21441336.

The previous prime is 21441323. The next prime is 21441347. The reversal of 21441337 is 73314412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17214201 + 4227136 = 4149^2 + 2056^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21441337 is a prime.

It is not a weakly prime, because it can be changed into another prime (21441347) 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, 10720668 + 10720669.

It is an arithmetic number, because the mean of its divisors is an integer number (10720669).

Almost surely, 2^21441337 is an apocalyptic number.

It is an amenable number.

21441337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441337 is an equidigital number, since it uses as much as digits as its factorization.

21441337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 21441337 is about 4630.4791328760. The cubic root of 21441337 is about 277.8117568685.

Adding to 21441337 its reverse (73314412), we get a palindrome (94755749).

It can be divided in two parts, 2144 and 1337, that added together give a square (3481 = 59²).

The spelling of 21441337 in words is "twenty-one million, four hundred forty-one thousand, three hundred thirty-seven".