21105184422 has 64 divisors (see below), whose sum is σ = 50836460544. Its totient is φ = 5710742400.

The previous prime is 21105184357. The next prime is 21105184423. The reversal of 21105184422 is 22448150112.

It is a self number, because there is not a number n which added to its sum of digits gives 21105184422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105184423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10593 + ... + 205724.

It is an arithmetic number, because the mean of its divisors is an integer number (794319696).

Almost surely, 2^21105184422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21105184422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25418230272).

21105184422 is an abundant number, since it is smaller than the sum of its proper divisors (29731276122).

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

21105184422 is a wasteful number, since it uses less digits than its factorization.

21105184422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216453.

The product of its (nonzero) digits is 5120, while the sum is 30.

The spelling of 21105184422 in words is "twenty-one billion, one hundred five million, one hundred eighty-four thousand, four hundred twenty-two".