21088433 has 4 divisors (see below), whose sum is σ = 21115248. Its totient is φ = 21061620.

The previous prime is 21088421. The next prime is 21088439. The reversal of 21088433 is 33488012.

It is a happy number.

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 21088433 - 2⁶ = 21088369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21088396 and 21088405.

It is not an unprimeable number, because it can be changed into a prime (21088439) 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, 12191 + ... + 13812.

It is an arithmetic number, because the mean of its divisors is an integer number (5278812).

Almost surely, 2^21088433 is an apocalyptic number.

It is an amenable number.

21088433 is a deficient number, since it is larger than the sum of its proper divisors (26815).

21088433 is an equidigital number, since it uses as much as digits as its factorization.

21088433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26814.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 21088433 is about 4592.2143895946. The cubic root of 21088433 is about 276.2791450451.

The spelling of 21088433 in words is "twenty-one million, eighty-eight thousand, four hundred thirty-three".