21296089 has 4 divisors (see below), whose sum is σ = 21697956. Its totient is φ = 20894224.

The previous prime is 21296083. The next prime is 21296111. The reversal of 21296089 is 98069212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6086089 + 15210000 = 2467^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 21296089 - 2⁷ = 21295961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21296083) 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, 200854 + ... + 200959.

It is an arithmetic number, because the mean of its divisors is an integer number (5424489).

Almost surely, 2^21296089 is an apocalyptic number.

It is an amenable number.

21296089 is a deficient number, since it is larger than the sum of its proper divisors (401867).

21296089 is an equidigital number, since it uses as much as digits as its factorization.

21296089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401866.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21296089 is about 4614.7685749125. The cubic root of 21296089 is about 277.1830171092.

The spelling of 21296089 in words is "twenty-one million, two hundred ninety-six thousand, eighty-nine".