11456121571 has 2 divisors, whose sum is σ = 11456121572. Its totient is φ = 11456121570.

The previous prime is 11456121569. The next prime is 11456121577. The reversal of 11456121571 is 17512165411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11456121571 - 2¹ = 11456121569 is a prime.

Together with 11456121569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11456121577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5728060785 + 5728060786.

It is an arithmetic number, because the mean of its divisors is an integer number (5728060786).

Almost surely, 2^11456121571 is an apocalyptic number.

11456121571 is a deficient number, since it is larger than the sum of its proper divisors (1).

11456121571 is an equidigital number, since it uses as much as digits as its factorization.

11456121571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 34.

Adding to 11456121571 its reverse (17512165411), we get a palindrome (28968286982).

The spelling of 11456121571 in words is "eleven billion, four hundred fifty-six million, one hundred twenty-one thousand, five hundred seventy-one".