21323145324 has 96 divisors (see below), whose sum is σ = 54201934080. Its totient is φ = 6485246208.

The previous prime is 21323145323. The next prime is 21323145329. The reversal of 21323145324 is 42354132312.

It is a junction number, because it is equal to n+sod(n) for n = 21323145291 and 21323145300.

It is not an unprimeable number, because it can be changed into a prime (21323145323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9396462 + ... + 9398730.

It is an arithmetic number, because the mean of its divisors is an integer number (564603480).

Almost surely, 2^21323145324 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 21323145324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27100967040).

21323145324 is an abundant number, since it is smaller than the sum of its proper divisors (32878788756).

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

21323145324 is a wasteful number, since it uses less digits than its factorization.

21323145324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959 (or 2957 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

Adding to 21323145324 its reverse (42354132312), we get a palindrome (63677277636).

The spelling of 21323145324 in words is "twenty-one billion, three hundred twenty-three million, one hundred forty-five thousand, three hundred twenty-four".