1109232021 has 4 divisors (see below), whose sum is σ = 1478976032. Its totient is φ = 739488012.

The previous prime is 1109231953. The next prime is 1109232053. The reversal of 1109232021 is 1202329011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1109232021 - 2¹⁸ = 1108969877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109232821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184872001 + ... + 184872006.

It is an arithmetic number, because the mean of its divisors is an integer number (369744008).

Almost surely, 2^1109232021 is an apocalyptic number.

It is an amenable number.

1109232021 is a deficient number, since it is larger than the sum of its proper divisors (369744011).

1109232021 is an equidigital number, since it uses as much as digits as its factorization.

1109232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369744010.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1109232021 is about 33305.1350545227. The cubic root of 1109232021 is about 1035.1599622070.

The spelling of 1109232021 in words is "one billion, one hundred nine million, two hundred thirty-two thousand, twenty-one".