19221004 has 12 divisors (see below), whose sum is σ = 36694728. Its totient is φ = 8736800.

The previous prime is 19221001. The next prime is 19221029. The reversal of 19221004 is 40012291.

It is not an unprimeable number, because it can be changed into a prime (19221001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218377 + ... + 218464.

It is an arithmetic number, because the mean of its divisors is an integer number (3057894).

Almost surely, 2^19221004 is an apocalyptic number.

It is an amenable number.

19221004 is a deficient number, since it is larger than the sum of its proper divisors (17473724).

19221004 is a wasteful number, since it uses less digits than its factorization.

19221004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436856 (or 436854 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 19221004 is about 4384.1765475400. The cubic root of 19221004 is about 267.8707886822.

Adding to 19221004 its reverse (40012291), we get a palindrome (59233295).

It can be divided in two parts, 1922 and 1004, that added together give a triangular number (2926 = T₇₆).

The spelling of 19221004 in words is "nineteen million, two hundred twenty-one thousand, four".