21232089 has 12 divisors (see below), whose sum is σ = 31726500. Its totient is φ = 13666464.

The previous prime is 21232073. The next prime is 21232091. The reversal of 21232089 is 98023212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3968064 + 17264025 = 1992^2 + 4155^2 .

It is not a de Polignac number, because 21232089 - 2⁴ = 21232073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21232049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40414 + ... + 40935.

It is an arithmetic number, because the mean of its divisors is an integer number (2643875).

Almost surely, 2^21232089 is an apocalyptic number.

21232089 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21232089 is a deficient number, since it is larger than the sum of its proper divisors (10494411).

21232089 is a wasteful number, since it uses less digits than its factorization.

21232089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81384 (or 81381 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21232089 is about 4607.8290983933. The cubic root of 21232089 is about 276.9050707131.

The spelling of 21232089 in words is "twenty-one million, two hundred thirty-two thousand, eighty-nine".