21816357024 has 144 divisors (see below), whose sum is σ = 72674140896. Its totient is φ = 5666572800.

The previous prime is 21816357011. The next prime is 21816357037. The reversal of 21816357024 is 42075361812.

It is an interprime number because it is at equal distance from previous prime (21816357011) and next prime (21816357037).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159067 + ... + 262554.

It is an arithmetic number, because the mean of its divisors is an integer number (504681534).

Almost surely, 2^21816357024 is an apocalyptic number.

21816357024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21816357024 is an abundant number, since it is smaller than the sum of its proper divisors (50857783872).

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

21816357024 is a wasteful number, since it uses less digits than its factorization.

21816357024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421659 (or 421644 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 21816357024 in words is "twenty-one billion, eight hundred sixteen million, three hundred fifty-seven thousand, twenty-four".