21440011331 has 8 divisors (see below), whose sum is σ = 22613310720. Its totient is φ = 20271199752.

The previous prime is 21440011249. The next prime is 21440011403. The reversal of 21440011331 is 13311004412.

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 21440011331 - 2¹⁸ = 21439749187 is a prime.

It is a super-3 number, since 3×21440011331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440011031) 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, 1112135 + ... + 1131248.

It is an arithmetic number, because the mean of its divisors is an integer number (2826663840).

Almost surely, 2^21440011331 is an apocalyptic number.

21440011331 is a deficient number, since it is larger than the sum of its proper divisors (1173299389).

21440011331 is a wasteful number, since it uses less digits than its factorization.

21440011331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243905.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21440011331 its reverse (13311004412), we get a palindrome (34751015743).

The spelling of 21440011331 in words is "twenty-one billion, four hundred forty million, eleven thousand, three hundred thirty-one".