21124313232 has 160 divisors (see below), whose sum is σ = 61252329600. Its totient is φ = 6217728000.

The previous prime is 21124313173. The next prime is 21124313233. The reversal of 21124313232 is 23231342112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21124313233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5215144 + ... + 5219192.

It is an arithmetic number, because the mean of its divisors is an integer number (382827060).

Almost surely, 2^21124313232 is an apocalyptic number.

21124313232 is a gapful number since it is divisible by the number (22) 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 21124313232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30626164800).

21124313232 is an abundant number, since it is smaller than the sum of its proper divisors (40128016368).

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

21124313232 is a wasteful number, since it uses less digits than its factorization.

21124313232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4353 (or 4347 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 21124313232 its reverse (23231342112), we get a palindrome (44355655344).

The spelling of 21124313232 in words is "twenty-one billion, one hundred twenty-four million, three hundred thirteen thousand, two hundred thirty-two".