21318883992 has 256 divisors, whose sum is σ = 68864947200. Its totient is φ = 5985239040.

The previous prime is 21318883987. The next prime is 21318884029. The reversal of 21318883992 is 29938881312.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 63 ways as a sum of consecutive naturals, for example, 32252142 + ... + 32252802.

It is an arithmetic number, because the mean of its divisors is an integer number (269003700).

Almost surely, 2^21318883992 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 21318883992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34432473600).

21318883992 is an abundant number, since it is smaller than the sum of its proper divisors (47546063208).

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

21318883992 is a wasteful number, since it uses less digits than its factorization.

21318883992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023 (or 1013 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 21318883992 in words is "twenty-one billion, three hundred eighteen million, eight hundred eighty-three thousand, nine hundred ninety-two".