21102342324 has 96 divisors (see below), whose sum is σ = 59289646080. Its totient is φ = 5706609408.

The previous prime is 21102342323. The next prime is 21102342347. The reversal of 21102342324 is 42324320112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21102342294 and 21102342303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102342323) 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, 1898487 + ... + 1909569.

It is an arithmetic number, because the mean of its divisors is an integer number (617600480).

Almost surely, 2^21102342324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102342324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29644823040).

21102342324 is an abundant number, since it is smaller than the sum of its proper divisors (38187303756).

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

21102342324 is a wasteful number, since it uses less digits than its factorization.

21102342324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12309 (or 12307 counting only the distinct ones).

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

Adding to 21102342324 its reverse (42324320112), we get a palindrome (63426662436).

The spelling of 21102342324 in words is "twenty-one billion, one hundred two million, three hundred forty-two thousand, three hundred twenty-four".