21027433 has 16 divisors (see below), whose sum is σ = 25985920. Its totient is φ = 16609536.

The previous prime is 21027421. The next prime is 21027443. The reversal of 21027433 is 33472012.

It is a cyclic number.

It is not a de Polignac number, because 21027433 - 2⁵ = 21027401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21027403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2785 + ... + 7057.

It is an arithmetic number, because the mean of its divisors is an integer number (1624120).

Almost surely, 2^21027433 is an apocalyptic number.

It is an amenable number.

21027433 is a deficient number, since it is larger than the sum of its proper divisors (4958487).

21027433 is a wasteful number, since it uses less digits than its factorization.

21027433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21027433 is about 4585.5679037607. The cubic root of 21027433 is about 276.0125011841.

Adding to 21027433 its reverse (33472012), we get a palindrome (54499445).

The spelling of 21027433 in words is "twenty-one million, twenty-seven thousand, four hundred thirty-three".