11121022009 has 2 divisors, whose sum is σ = 11121022010. Its totient is φ = 11121022008.

The previous prime is 11121021973. The next prime is 11121022021. The reversal of 11121022009 is 90022012111.

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., 6679465984 + 4441556025 = 81728^2 + 66645^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121022009 - 2¹⁹ = 11120497721 is a prime.

It is not a weakly prime, because it can be changed into another prime (11121022909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560511004 + 5560511005.

It is an arithmetic number, because the mean of its divisors is an integer number (5560511005).

Almost surely, 2^11121022009 is an apocalyptic number.

It is an amenable number.

11121022009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121022009 is an equidigital number, since it uses as much as digits as its factorization.

11121022009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

It can be divided in two parts, 1112102 and 2009, that added together give a palindrome (1114111).

The spelling of 11121022009 in words is "eleven billion, one hundred twenty-one million, twenty-two thousand, nine".