21443224311 has 72 divisors (see below), whose sum is σ = 33740061680. Its totient is φ = 13449784320.

The previous prime is 21443224291. The next prime is 21443224321. The reversal of 21443224311 is 11342234412.

21443224311 is a `hidden beast` number, since 21 + 4 + 4 + 322 + 4 + 311 = 666.

It is not a de Polignac number, because 21443224311 - 2⁵ = 21443224279 is a prime.

It is a super-2 number, since 2×21443224311² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443224321) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 189762991 + ... + 189763103.

Almost surely, 2^21443224311 is an apocalyptic number.

21443224311 is a deficient number, since it is larger than the sum of its proper divisors (12296837369).

21443224311 is an equidigital number, since it uses as much as digits as its factorization.

21443224311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 194 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21443224311 its reverse (11342234412), we get a palindrome (32785458723).

The spelling of 21443224311 in words is "twenty-one billion, four hundred forty-three million, two hundred twenty-four thousand, three hundred eleven".