11131221097 has 2 divisors, whose sum is σ = 11131221098. Its totient is φ = 11131221096.

The previous prime is 11131221083. The next prime is 11131221103. The reversal of 11131221097 is 79012213111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9408224016 + 1722997081 = 96996^2 + 41509^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131221097 - 2¹¹ = 11131219049 is a prime.

It is a super-2 number, since 2×11131221097² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11131221037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565610548 + 5565610549.

It is an arithmetic number, because the mean of its divisors is an integer number (5565610549).

Almost surely, 2^11131221097 is an apocalyptic number.

It is an amenable number.

11131221097 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131221097 is an equidigital number, since it uses as much as digits as its factorization.

11131221097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 28.

The spelling of 11131221097 in words is "eleven billion, one hundred thirty-one million, two hundred twenty-one thousand, ninety-seven".