21671088912 has 240 divisors, whose sum is σ = 72472682880. Its totient is φ = 5967360000.

The previous prime is 21671088893. The next prime is 21671088919. The reversal of 21671088912 is 21988017612.

It is not an unprimeable number, because it can be changed into a prime (21671088919) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 767037 + ... + 794787.

It is an arithmetic number, because the mean of its divisors is an integer number (301969512).

Almost surely, 2^21671088912 is an apocalyptic number.

21671088912 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 21671088912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36236341440).

21671088912 is an abundant number, since it is smaller than the sum of its proper divisors (50801593968).

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

21671088912 is a wasteful number, since it uses less digits than its factorization.

21671088912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27822 (or 27813 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 21671088912 in words is "twenty-one billion, six hundred seventy-one million, eighty-eight thousand, nine hundred twelve".