19221434 has 4 divisors (see below), whose sum is σ = 28832154. Its totient is φ = 9610716.

The previous prime is 19221427. The next prime is 19221439. The reversal of 19221434 is 43412291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43412291 = 13 ⋅3339407.

It can be written as a sum of positive squares in only one way, i.e., 17247409 + 1974025 = 4153^2 + 1405^2 .

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (19221439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4805357 + ... + 4805360.

Almost surely, 2^19221434 is an apocalyptic number.

19221434 is a deficient number, since it is larger than the sum of its proper divisors (9610720).

19221434 is an equidigital number, since it uses as much as digits as its factorization.

19221434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9610719.

The product of its digits is 1728, while the sum is 26.

The square root of 19221434 is about 4384.2255872617. The cubic root of 19221434 is about 267.8727862119.

The spelling of 19221434 in words is "nineteen million, two hundred twenty-one thousand, four hundred thirty-four".