21550371822 has 96 divisors (see below), whose sum is σ = 54090167040. Its totient is φ = 6073562880.

The previous prime is 21550371811. The next prime is 21550371841. The reversal of 21550371822 is 22817305512.

21550371822 is a `hidden beast` number, since 2 + 1 + 5 + 503 + 71 + 82 + 2 = 666.

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, 9212329 + ... + 9214667.

It is an arithmetic number, because the mean of its divisors is an integer number (563439240).

Almost surely, 2^21550371822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21550371822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27045083520).

21550371822 is an abundant number, since it is smaller than the sum of its proper divisors (32539795218).

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

21550371822 is a wasteful number, since it uses less digits than its factorization.

21550371822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3315 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 21550371822 in words is "twenty-one billion, five hundred fifty million, three hundred seventy-one thousand, eight hundred twenty-two".