21474443318880 has 192 divisors, whose sum is σ = 68354104186368. Its totient is φ = 5666531696640.

The previous prime is 21474443318851. The next prime is 21474443318893. The reversal of 21474443318880 is 8881334447412.

It is a happy number.

It is a super-2 number, since 2×21474443318880² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21474443318880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63956235 + ... + 64291125.

It is an arithmetic number, because the mean of its divisors is an integer number (356010959304).

Almost surely, 2^{21474443318880} is an apocalyptic number.

21474443318880 is a gapful number since it is divisible by the number (20) 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 21474443318880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34177052093184).

21474443318880 is an abundant number, since it is smaller than the sum of its proper divisors (46879660867488).

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

21474443318880 is a wasteful number, since it uses less digits than its factorization.

21474443318880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336309 (or 336301 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 57.

The spelling of 21474443318880 in words is "twenty-one trillion, four hundred seventy-four billion, four hundred forty-three million, three hundred eighteen thousand, eight hundred eighty".