19221804 has 72 divisors (see below), whose sum is σ = 56259840. Its totient is φ = 5419872.

The previous prime is 19221803. The next prime is 19221827. The reversal of 19221804 is 40812291.

It is not an unprimeable number, because it can be changed into a prime (19221803) 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 23 ways as a sum of consecutive naturals, for example, 20457 + ... + 21375.

Almost surely, 2^19221804 is an apocalyptic number.

19221804 is a gapful number since it is divisible by the number (14) 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 19221804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28129920).

19221804 is an abundant number, since it is smaller than the sum of its proper divisors (37038036).

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

19221804 is a wasteful number, since it uses less digits than its factorization.

19221804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1014 counting only the distinct ones).

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

The square root of 19221804 is about 4384.2677837924. The cubic root of 19221804 is about 267.8745049927.

The spelling of 19221804 in words is "nineteen million, two hundred twenty-one thousand, eight hundred four".