21116324124 has 144 divisors (see below), whose sum is σ = 62394049536. Its totient is φ = 5896022400.

The previous prime is 21116324093. The next prime is 21116324137. The reversal of 21116324124 is 42142361112.

21116324124 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 632 + 4 + 1 + 24 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15289914 + ... + 15291294.

Almost surely, 2^21116324124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21116324124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31197024768).

21116324124 is an abundant number, since it is smaller than the sum of its proper divisors (41277725412).

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

21116324124 is a wasteful number, since it uses less digits than its factorization.

21116324124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736 (or 2731 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 21116324124 its reverse (42142361112), we get a palindrome (63258685236).

The spelling of 21116324124 in words is "twenty-one billion, one hundred sixteen million, three hundred twenty-four thousand, one hundred twenty-four".