11223121109 has 2 divisors, whose sum is σ = 11223121110. Its totient is φ = 11223121108.

The previous prime is 11223121067. The next prime is 11223121139. The reversal of 11223121109 is 90112132211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10625074084 + 598047025 = 103078^2 + 24455^2 .

It is a cyclic number.

It is not a de Polignac number, because 11223121109 - 2²⁴ = 11206343893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11223121139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611560554 + 5611560555.

It is an arithmetic number, because the mean of its divisors is an integer number (5611560555).

Almost surely, 2^11223121109 is an apocalyptic number.

It is an amenable number.

11223121109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11223121109 is an equidigital number, since it uses as much as digits as its factorization.

11223121109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 11223121109 in words is "eleven billion, two hundred twenty-three million, one hundred twenty-one thousand, one hundred nine".