21088833 has 4 divisors (see below), whose sum is σ = 28118448. Its totient is φ = 14059220.

The previous prime is 21088819. The next prime is 21088849. The reversal of 21088833 is 33888012.

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 a cyclic number.

It is not a de Polignac number, because 21088833 - 2⁹ = 21088321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21088794 and 21088803.

It is not an unprimeable number, because it can be changed into a prime (21081833) 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, 3514803 + ... + 3514808.

It is an arithmetic number, because the mean of its divisors is an integer number (7029612).

Almost surely, 2^21088833 is an apocalyptic number.

It is an amenable number.

21088833 is a deficient number, since it is larger than the sum of its proper divisors (7029615).

21088833 is an equidigital number, since it uses as much as digits as its factorization.

21088833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7029614.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 21088833 is about 4592.2579413617. The cubic root of 21088833 is about 276.2808918314.

The spelling of 21088833 in words is "twenty-one million, eighty-eight thousand, eight hundred thirty-three".