11121101281 has 2 divisors, whose sum is σ = 11121101282. Its totient is φ = 11121101280.

The previous prime is 11121101273. The next prime is 11121101287. The reversal of 11121101281 is 18210112111.

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., 11107262881 + 13838400 = 105391^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121101281 - 2³ = 11121101273 is a prime.

It is a super-2 number, since 2×11121101281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11121101287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560550640 + 5560550641.

It is an arithmetic number, because the mean of its divisors is an integer number (5560550641).

Almost surely, 2^11121101281 is an apocalyptic number.

It is an amenable number.

11121101281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121101281 is an equidigital number, since it uses as much as digits as its factorization.

11121101281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 11121101281 its reverse (18210112111), we get a palindrome (29331213392).

The spelling of 11121101281 in words is "eleven billion, one hundred twenty-one million, one hundred one thousand, two hundred eighty-one".