11123311921 has 2 divisors, whose sum is σ = 11123311922. Its totient is φ = 11123311920.

The previous prime is 11123311889. The next prime is 11123311963. The reversal of 11123311921 is 12911332111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10534764321 + 588547600 = 102639^2 + 24260^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123311921 - 2⁵ = 11123311889 is a prime.

It is not a weakly prime, because it can be changed into another prime (11183311921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561655960 + 5561655961.

It is an arithmetic number, because the mean of its divisors is an integer number (5561655961).

Almost surely, 2^11123311921 is an apocalyptic number.

It is an amenable number.

11123311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123311921 is an equidigital number, since it uses as much as digits as its factorization.

11123311921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 25.

The spelling of 11123311921 in words is "eleven billion, one hundred twenty-three million, three hundred eleven thousand, nine hundred twenty-one".