21321312024 has 64 divisors (see below), whose sum is σ = 55446300000. Its totient is φ = 6824079360.

The previous prime is 21321312013. The next prime is 21321312031. The reversal of 21321312024 is 42021312312.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41352 + ... + 210600.

Almost surely, 2^21321312024 is an apocalyptic number.

21321312024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321312024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27723150000).

21321312024 is an abundant number, since it is smaller than the sum of its proper divisors (34124987976).

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

21321312024 is a wasteful number, since it uses less digits than its factorization.

21321312024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169468 (or 169464 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21321312024 its reverse (42021312312), we get a palindrome (63342624336).

The spelling of 21321312024 in words is "twenty-one billion, three hundred twenty-one million, three hundred twelve thousand, twenty-four".