21440110650571 has 2 divisors, whose sum is σ = 21440110650572. Its totient is φ = 21440110650570.

The previous prime is 21440110650503. The next prime is 21440110650577. The reversal of 21440110650571 is 17505601104412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21440110650571 - 2¹⁹ = 21440110126283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21440110650571.

It is not a weakly prime, because it can be changed into another prime (21440110650577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720055325285 + 10720055325286.

It is an arithmetic number, because the mean of its divisors is an integer number (10720055325286).

Almost surely, 2^{21440110650571} is an apocalyptic number.

21440110650571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440110650571 is an equidigital number, since it uses as much as digits as its factorization.

21440110650571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 37.

Adding to 21440110650571 its reverse (17505601104412), we get a palindrome (38945711754983).

The spelling of 21440110650571 in words is "twenty-one trillion, four hundred forty billion, one hundred ten million, six hundred fifty thousand, five hundred seventy-one".