21027733 has 4 divisors (see below), whose sum is σ = 21133600. Its totient is φ = 20921868.

The previous prime is 21027709. The next prime is 21027767. The reversal of 21027733 is 33772012.

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 21027733 - 2⁵ = 21027701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21027698 and 21027707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027133) 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, 52635 + ... + 53032.

It is an arithmetic number, because the mean of its divisors is an integer number (5283400).

Almost surely, 2^21027733 is an apocalyptic number.

It is an amenable number.

21027733 is a deficient number, since it is larger than the sum of its proper divisors (105867).

21027733 is a wasteful number, since it uses less digits than its factorization.

21027733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105866.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 21027733 is about 4585.6006149686. The cubic root of 21027733 is about 276.0138138084.

Adding to 21027733 its reverse (33772012), we get a palindrome (54799745).

The spelling of 21027733 in words is "twenty-one million, twenty-seven thousand, seven hundred thirty-three".