21340412324 has 144 divisors (see below), whose sum is σ = 52290322560. Its totient is φ = 7413120000.

The previous prime is 21340412297. The next prime is 21340412333. The reversal of 21340412324 is 42321404312.

It is a junction number, because it is equal to n+sod(n) for n = 21340412293 and 21340412302.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1084574 + ... + 1104074.

It is an arithmetic number, because the mean of its divisors is an integer number (363127240).

Almost surely, 2^21340412324 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 21340412324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26145161280).

21340412324 is an abundant number, since it is smaller than the sum of its proper divisors (30949910236).

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

21340412324 is a wasteful number, since it uses less digits than its factorization.

21340412324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19570 (or 19557 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21340412324 its reverse (42321404312), we get a palindrome (63661816636).

The spelling of 21340412324 in words is "twenty-one billion, three hundred forty million, four hundred twelve thousand, three hundred twenty-four".