21027233 has 4 divisors (see below), whose sum is σ = 21752340. Its totient is φ = 20302128.

The previous prime is 21027179. The next prime is 21027239. The reversal of 21027233 is 33272012.

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 9138529 + 11888704 = 3023^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 21027233 - 2⁶ = 21027169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21027239) 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, 362510 + ... + 362567.

It is an arithmetic number, because the mean of its divisors is an integer number (5438085).

Almost surely, 2^21027233 is an apocalyptic number.

It is an amenable number.

21027233 is a deficient number, since it is larger than the sum of its proper divisors (725107).

21027233 is an equidigital number, since it uses as much as digits as its factorization.

21027233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725106.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21027233 is about 4585.5460961591. The cubic root of 21027233 is about 276.0116260943.

Adding to 21027233 its reverse (33272012), we get a palindrome (54299245).

The spelling of 21027233 in words is "twenty-one million, twenty-seven thousand, two hundred thirty-three".