11182855721 has 2 divisors, whose sum is σ = 11182855722. Its totient is φ = 11182855720.

The previous prime is 11182855679. The next prime is 11182855729. The reversal of 11182855721 is 12755828111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7429578025 + 3753277696 = 86195^2 + 61264^2 .

It is a cyclic number.

It is not a de Polignac number, because 11182855721 - 2¹⁸ = 11182593577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11182855729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5591427860 + 5591427861.

It is an arithmetic number, because the mean of its divisors is an integer number (5591427861).

Almost surely, 2^11182855721 is an apocalyptic number.

It is an amenable number.

11182855721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11182855721 is an equidigital number, since it uses as much as digits as its factorization.

11182855721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 41.

The spelling of 11182855721 in words is "eleven billion, one hundred eighty-two million, eight hundred fifty-five thousand, seven hundred twenty-one".