21124423200 has 72 divisors (see below), whose sum is σ = 68760005328. Its totient is φ = 5633178880.

The previous prime is 21124423183. The next prime is 21124423247. The reversal of 21124423200 is 232442112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4398522 + ... + 4403321.

It is an arithmetic number, because the mean of its divisors is an integer number (955000074).

Almost surely, 2^21124423200 is an apocalyptic number.

21124423200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124423200 is an abundant number, since it is smaller than the sum of its proper divisors (47635582128).

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

21124423200 is a wasteful number, since it uses less digits than its factorization.

21124423200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8801866 (or 8801853 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21124423200 its reverse (232442112), we get a palindrome (21356865312).

The spelling of 21124423200 in words is "twenty-one billion, one hundred twenty-four million, four hundred twenty-three thousand, two hundred".