21863758224 has 80 divisors (see below), whose sum is σ = 70418350080. Its totient is φ = 5678897280.

The previous prime is 21863758219. The next prime is 21863758229. The reversal of 21863758224 is 42285736812.

It is an interprime number because it is at equal distance from previous prime (21863758219) and next prime (21863758229).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21863758229) 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, 2954064 + ... + 2961455.

It is an arithmetic number, because the mean of its divisors is an integer number (880229376).

Almost surely, 2^21863758224 is an apocalyptic number.

21863758224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21863758224 is an abundant number, since it is smaller than the sum of its proper divisors (48554591856).

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

21863758224 is a wasteful number, since it uses less digits than its factorization.

21863758224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915548 (or 5915542 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

It can be divided in two parts, 21863 and 758224, that added together give a palindrome (780087).

The spelling of 21863758224 in words is "twenty-one billion, eight hundred sixty-three million, seven hundred fifty-eight thousand, two hundred twenty-four".