21322351441 has 2 divisors, whose sum is σ = 21322351442. Its totient is φ = 21322351440.

The previous prime is 21322351429. The next prime is 21322351447. The reversal of 21322351441 is 14415322312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21320380225 + 1971216 = 146015^2 + 1404^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322351441 - 2⁵ = 21322351409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322351447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661175720 + 10661175721.

It is an arithmetic number, because the mean of its divisors is an integer number (10661175721).

Almost surely, 2^21322351441 is an apocalyptic number.

It is an amenable number.

21322351441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322351441 is an equidigital number, since it uses as much as digits as its factorization.

21322351441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

Adding to 21322351441 its reverse (14415322312), we get a palindrome (35737673753).

The spelling of 21322351441 in words is "twenty-one billion, three hundred twenty-two million, three hundred fifty-one thousand, four hundred forty-one".