19221084 has 144 divisors (see below), whose sum is σ = 57607200. Its totient is φ = 5515776.

The previous prime is 19221071. The next prime is 19221089. The reversal of 19221084 is 48012291.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19221089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 662782 + ... + 662810.

It is an arithmetic number, because the mean of its divisors is an integer number (400050).

Almost surely, 2^19221084 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 19221084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28803600).

19221084 is an abundant number, since it is smaller than the sum of its proper divisors (38386116).

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

19221084 is a wasteful number, since it uses less digits than its factorization.

19221084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 19221084 is about 4384.1856712507. The cubic root of 19221084 is about 267.8711603179.

The spelling of 19221084 in words is "nineteen million, two hundred twenty-one thousand, eighty-four".