21443302241 has 2 divisors, whose sum is σ = 21443302242. Its totient is φ = 21443302240.

The previous prime is 21443302217. The next prime is 21443302253. The reversal of 21443302241 is 14220334412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18359166016 + 3084136225 = 135496^2 + 55535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21443302241 is a prime.

It is a super-3 number, since 3×21443302241³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21443302241.

It is not a weakly prime, because it can be changed into another prime (21443302261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721651120 + 10721651121.

It is an arithmetic number, because the mean of its divisors is an integer number (10721651121).

Almost surely, 2^21443302241 is an apocalyptic number.

It is an amenable number.

21443302241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443302241 is an equidigital number, since it uses as much as digits as its factorization.

21443302241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21443302241 its reverse (14220334412), we get a palindrome (35663636653).

The spelling of 21443302241 in words is "twenty-one billion, four hundred forty-three million, three hundred two thousand, two hundred forty-one".