21244733 has 8 divisors (see below), whose sum is σ = 22032000. Its totient is φ = 20461168.

The previous prime is 21244723. The next prime is 21244757. The reversal of 21244733 is 33744212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21244733 - 2⁶ = 21244669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16760 + ... + 17982.

It is an arithmetic number, because the mean of its divisors is an integer number (2754000).

Almost surely, 2^21244733 is an apocalyptic number.

It is an amenable number.

21244733 is a deficient number, since it is larger than the sum of its proper divisors (787267).

21244733 is a wasteful number, since it uses less digits than its factorization.

21244733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851.

The product of its digits is 4032, while the sum is 26.

The square root of 21244733 is about 4609.2009068818. The cubic root of 21244733 is about 276.9600267271.

Adding to 21244733 its reverse (33744212), we get a palindrome (54988945).

The spelling of 21244733 in words is "twenty-one million, two hundred forty-four thousand, seven hundred thirty-three".