21312450324 has 48 divisors (see below), whose sum is σ = 60277640640. Its totient is φ = 6458317920.

The previous prime is 21312450323. The next prime is 21312450337. The reversal of 21312450324 is 42305421312.

21312450324 is a `hidden beast` number, since 2 + 13 + 124 + 503 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312450323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8968699 + ... + 8971074.

It is an arithmetic number, because the mean of its divisors is an integer number (1255784180).

Almost surely, 2^21312450324 is an apocalyptic number.

It is an amenable number.

21312450324 is an abundant number, since it is smaller than the sum of its proper divisors (38965190316).

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

21312450324 is a wasteful number, since it uses less digits than its factorization.

21312450324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17939797 (or 17939789 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21312450324 its reverse (42305421312), we get a palindrome (63617871636).

The spelling of 21312450324 in words is "twenty-one billion, three hundred twelve million, four hundred fifty thousand, three hundred twenty-four".