21222312324 has 24 divisors (see below), whose sum is σ = 49521110688. Its totient is φ = 7073763840.

The previous prime is 21222312323. The next prime is 21222312341. The reversal of 21222312324 is 42321322212.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21222312294 and 21222312303.

It is not an unprimeable number, because it can be changed into a prime (21222312323) 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, 409479 + ... + 458385.

It is an arithmetic number, because the mean of its divisors is an integer number (2063379612).

Almost surely, 2^21222312324 is an apocalyptic number.

It is an amenable number.

21222312324 is an abundant number, since it is smaller than the sum of its proper divisors (28298798364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222312324 is a wasteful number, since it uses less digits than its factorization.

21222312324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85075 (or 85073 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

Adding to 21222312324 its reverse (42321322212), we get a palindrome (63543634536).

The spelling of 21222312324 in words is "twenty-one billion, two hundred twenty-two million, three hundred twelve thousand, three hundred twenty-four".