21340013324 has 72 divisors (see below), whose sum is σ = 46478743920. Its totient is φ = 8522236800.

The previous prime is 21340013323. The next prime is 21340013347. The reversal of 21340013324 is 42331004312.

It is a self number, because there is not a number n which added to its sum of digits gives 21340013324.

It is not an unprimeable number, because it can be changed into a prime (21340013323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180194 + ... + 274134.

It is an arithmetic number, because the mean of its divisors is an integer number (645538110).

Almost surely, 2^21340013324 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 21340013324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23239371960).

21340013324 is an abundant number, since it is smaller than the sum of its proper divisors (25138730596).

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

21340013324 is a wasteful number, since it uses less digits than its factorization.

21340013324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94039 (or 94030 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21340013324 its reverse (42331004312), we get a palindrome (63671017636).

The spelling of 21340013324 in words is "twenty-one billion, three hundred forty million, thirteen thousand, three hundred twenty-four".