1109224021 has 2 divisors, whose sum is σ = 1109224022. Its totient is φ = 1109224020.

The previous prime is 1109223991. The next prime is 1109224057. The reversal of 1109224021 is 1204229011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 802588900 + 306635121 = 28330^2 + 17511^2 .

It is an emirp because it is prime and its reverse (1204229011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1109224021 - 2¹¹ = 1109221973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1109223983 and 1109224001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109224091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554612010 + 554612011.

It is an arithmetic number, because the mean of its divisors is an integer number (554612011).

Almost surely, 2^1109224021 is an apocalyptic number.

It is an amenable number.

1109224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109224021 is an equidigital number, since it uses as much as digits as its factorization.

1109224021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1109224021 is about 33305.0149527064. The cubic root of 1109224021 is about 1035.1574736084.

The spelling of 1109224021 in words is "one billion, one hundred nine million, two hundred twenty-four thousand, twenty-one".