11569376821 has 2 divisors, whose sum is σ = 11569376822. Its totient is φ = 11569376820.

The previous prime is 11569376813. The next prime is 11569376851. The reversal of 11569376821 is 12867396511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11569368721 + 8100 = 107561^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 11569376821 - 2³ = 11569376813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11569376851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5784688410 + 5784688411.

It is an arithmetic number, because the mean of its divisors is an integer number (5784688411).

Almost surely, 2^11569376821 is an apocalyptic number.

It is an amenable number.

11569376821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11569376821 is an equidigital number, since it uses as much as digits as its factorization.

11569376821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The spelling of 11569376821 in words is "eleven billion, five hundred sixty-nine million, three hundred seventy-six thousand, eight hundred twenty-one".