11405225521 has 2 divisors, whose sum is σ = 11405225522. Its totient is φ = 11405225520.

The previous prime is 11405225519. The next prime is 11405225563. The reversal of 11405225521 is 12552250411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7627402225 + 3777823296 = 87335^2 + 61464^2 .

It is a cyclic number.

It is not a de Polignac number, because 11405225521 - 2¹ = 11405225519 is a prime.

Together with 11405225519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 11405225521.

It is not a weakly prime, because it can be changed into another prime (11405225581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5702612760 + 5702612761.

It is an arithmetic number, because the mean of its divisors is an integer number (5702612761).

Almost surely, 2^11405225521 is an apocalyptic number.

It is an amenable number.

11405225521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11405225521 is an equidigital number, since it uses as much as digits as its factorization.

11405225521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 11405225521 its reverse (12552250411), we get a palindrome (23957475932).

The spelling of 11405225521 in words is "eleven billion, four hundred five million, two hundred twenty-five thousand, five hundred twenty-one".