1109227921 has 4 divisors (see below), whose sum is σ = 1139207092. Its totient is φ = 1079248752.

The previous prime is 1109227913. The next prime is 1109227939. The reversal of 1109227921 is 1297229011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1297229011 = 13 ⋅99786847.

It can be written as a sum of positive squares in 2 ways, for example, as 892814400 + 216413521 = 29880^2 + 14711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109227921 - 2³ = 1109227913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109227991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14989530 + ... + 14989603.

It is an arithmetic number, because the mean of its divisors is an integer number (284801773).

Almost surely, 2^1109227921 is an apocalyptic number.

It is an amenable number.

1109227921 is a deficient number, since it is larger than the sum of its proper divisors (29979171).

1109227921 is an equidigital number, since it uses as much as digits as its factorization.

1109227921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29979170.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1109227921 is about 33305.0735023960. The cubic root of 1109227921 is about 1035.1586868017.

The spelling of 1109227921 in words is "one billion, one hundred nine million, two hundred twenty-seven thousand, nine hundred twenty-one".