21022231441 has 2 divisors, whose sum is σ = 21022231442. Its totient is φ = 21022231440.

The previous prime is 21022231409. The next prime is 21022231523. The reversal of 21022231441 is 14413222012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18775850625 + 2246380816 = 137025^2 + 47396^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022231441 - 2⁵ = 21022231409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022235441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511115720 + 10511115721.

It is an arithmetic number, because the mean of its divisors is an integer number (10511115721).

Almost surely, 2^21022231441 is an apocalyptic number.

It is an amenable number.

21022231441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022231441 is an equidigital number, since it uses as much as digits as its factorization.

21022231441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21022231441 its reverse (14413222012), we get a palindrome (35435453453).

The spelling of 21022231441 in words is "twenty-one billion, twenty-two million, two hundred thirty-one thousand, four hundred forty-one".