21443210441 has 2 divisors, whose sum is σ = 21443210442. Its totient is φ = 21443210440.

The previous prime is 21443210413. The next prime is 21443210483. The reversal of 21443210441 is 14401234412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11455206841 + 9988003600 = 107029^2 + 99940^2 .

It is a cyclic number.

It is not a de Polignac number, because 21443210441 - 2¹⁸ = 21442948297 is a prime.

It is a super-2 number, since 2×21443210441² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21443210441.

It is not a weakly prime, because it can be changed into another prime (21443210401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721605220 + 10721605221.

It is an arithmetic number, because the mean of its divisors is an integer number (10721605221).

Almost surely, 2^21443210441 is an apocalyptic number.

It is an amenable number.

21443210441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443210441 is an equidigital number, since it uses as much as digits as its factorization.

21443210441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21443210441 its reverse (14401234412), we get a palindrome (35844444853).

The spelling of 21443210441 in words is "twenty-one billion, four hundred forty-three million, two hundred ten thousand, four hundred forty-one".