21040244333 has 4 divisors (see below), whose sum is σ = 21040686048. Its totient is φ = 21039802620.

The previous prime is 21040244311. The next prime is 21040244341. The reversal of 21040244333 is 33344204012.

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 a de Polignac number, because none of the positive numbers 2^k-21040244333 is a prime.

It is a super-2 number, since 2×21040244333² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040243333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139391 + ... + 248012.

It is an arithmetic number, because the mean of its divisors is an integer number (5260171512).

Almost surely, 2^21040244333 is an apocalyptic number.

It is an amenable number.

21040244333 is a deficient number, since it is larger than the sum of its proper divisors (441715).

21040244333 is an equidigital number, since it uses as much as digits as its factorization.

21040244333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441714.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21040244333 its reverse (33344204012), we get a palindrome (54384448345).

The spelling of 21040244333 in words is "twenty-one billion, forty million, two hundred forty-four thousand, three hundred thirty-three".