11223445567921 has 2 divisors, whose sum is σ = 11223445567922. Its totient is φ = 11223445567920.

The previous prime is 11223445567787. The next prime is 11223445567927. The reversal of 11223445567921 is 12976554432211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10859239352896 + 364206215025 = 3295336^2 + 603495^2 .

It is a cyclic number.

It is not a de Polignac number, because 11223445567921 - 2¹⁵ = 11223445535153 is a prime.

It is not a weakly prime, because it can be changed into another prime (11223445567927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611722783960 + 5611722783961.

It is an arithmetic number, because the mean of its divisors is an integer number (5611722783961).

Almost surely, 2^{11223445567921} is an apocalyptic number.

It is an amenable number.

11223445567921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11223445567921 is an equidigital number, since it uses as much as digits as its factorization.

11223445567921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 52.

The spelling of 11223445567921 in words is "eleven trillion, two hundred twenty-three billion, four hundred forty-five million, five hundred sixty-seven thousand, nine hundred twenty-one".