21221443413231 has 32 divisors (see below), whose sum is σ = 28785655266816. Its totient is φ = 13902864624000.

The previous prime is 21221443413199. The next prime is 21221443413263. The reversal of 21221443413231 is 13231434412212.

It is an interprime number because it is at equal distance from previous prime (21221443413199) and next prime (21221443413263).

It is not a de Polignac number, because 21221443413231 - 2⁵ = 21221443413199 is a prime.

It is a super-2 number, since 2×21221443413231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221443413192 and 21221443413201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221443813231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 986253285 + ... + 986274801.

It is an arithmetic number, because the mean of its divisors is an integer number (899551727088).

Almost surely, 2^{21221443413231} is an apocalyptic number.

21221443413231 is a deficient number, since it is larger than the sum of its proper divisors (7564211853585).

21221443413231 is a wasteful number, since it uses less digits than its factorization.

21221443413231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26303.

The product of its digits is 27648, while the sum is 33.

Adding to 21221443413231 its reverse (13231434412212), we get a palindrome (34452877825443).

The spelling of 21221443413231 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred forty-three million, four hundred thirteen thousand, two hundred thirty-one".