11215942081 has 2 divisors, whose sum is σ = 11215942082. Its totient is φ = 11215942080.

The previous prime is 11215942063. The next prime is 11215942121. The reversal of 11215942081 is 18024951211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11191735681 + 24206400 = 105791^2 + 4920^2 .

It is an emirp because it is prime and its reverse (18024951211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11215942081 is a prime.

It is a super-2 number, since 2×11215942081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11215942061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5607971040 + 5607971041.

It is an arithmetic number, because the mean of its divisors is an integer number (5607971041).

Almost surely, 2^11215942081 is an apocalyptic number.

It is an amenable number.

11215942081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11215942081 is an equidigital number, since it uses as much as digits as its factorization.

11215942081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 11215942081 in words is "eleven billion, two hundred fifteen million, nine hundred forty-two thousand, eighty-one".