1089309021 has 4 divisors (see below), whose sum is σ = 1452412032. Its totient is φ = 726206012.

The previous prime is 1089309019. The next prime is 1089309037. The reversal of 1089309021 is 1209039801.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1209039801 = 3 ⋅403013267.

It is a cyclic number.

It is not a de Polignac number, because 1089309021 - 2¹ = 1089309019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089309041) 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, 181551501 + ... + 181551506.

It is an arithmetic number, because the mean of its divisors is an integer number (363103008).

Almost surely, 2^1089309021 is an apocalyptic number.

It is an amenable number.

1089309021 is a deficient number, since it is larger than the sum of its proper divisors (363103011).

1089309021 is an equidigital number, since it uses as much as digits as its factorization.

1089309021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363103010.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1089309021 is about 33004.6818042532. The cubic root of 1089309021 is about 1028.9249539873.

The spelling of 1089309021 in words is "one billion, eighty-nine million, three hundred nine thousand, twenty-one".