21440303331 has 8 divisors (see below), whose sum is σ = 28870111824. Its totient is φ = 14152015200.

The previous prime is 21440303317. The next prime is 21440303333. The reversal of 21440303331 is 13330304412.

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

It is not a de Polignac number, because 21440303331 - 2⁵ = 21440303299 is a prime.

It is a super-2 number, since 2×21440303331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21440303333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35379736 + ... + 35380341.

It is an arithmetic number, because the mean of its divisors is an integer number (3608763978).

Almost surely, 2^21440303331 is an apocalyptic number.

21440303331 is a deficient number, since it is larger than the sum of its proper divisors (7429808493).

21440303331 is a wasteful number, since it uses less digits than its factorization.

21440303331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70760181.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21440303331 its reverse (13330304412), we get a palindrome (34770607743).

The spelling of 21440303331 in words is "twenty-one billion, four hundred forty million, three hundred three thousand, three hundred thirty-one".