21422331361 has 2 divisors, whose sum is σ = 21422331362. Its totient is φ = 21422331360.

The previous prime is 21422331317. The next prime is 21422331409. The reversal of 21422331361 is 16313322412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16589440000 + 4832891361 = 128800^2 + 69519^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422331361 - 2¹⁹ = 21421807073 is a prime.

It is a super-2 number, since 2×21422331361² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21422361361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711165680 + 10711165681.

It is an arithmetic number, because the mean of its divisors is an integer number (10711165681).

Almost surely, 2^21422331361 is an apocalyptic number.

It is an amenable number.

21422331361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422331361 is an equidigital number, since it uses as much as digits as its factorization.

21422331361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

Adding to 21422331361 its reverse (16313322412), we get a palindrome (37735653773).

The spelling of 21422331361 in words is "twenty-one billion, four hundred twenty-two million, three hundred thirty-one thousand, three hundred sixty-one".