19221841 has 4 divisors (see below), whose sum is σ = 19253812. Its totient is φ = 19189872.

The previous prime is 19221827. The next prime is 19221913. The reversal of 19221841 is 14812291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14812291 = 13 ⋅1139407.

It can be written as a sum of positive squares in 2 ways, for example, as 5271616 + 13950225 = 2296^2 + 3735^2 .

It is a cyclic number.

It is not a de Polignac number, because 19221841 - 2¹⁷ = 19090769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19221341) 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 3 ways as a sum of consecutive naturals, for example, 15066 + ... + 16291.

It is an arithmetic number, because the mean of its divisors is an integer number (4813453).

Almost surely, 2^19221841 is an apocalyptic number.

It is an amenable number.

19221841 is a deficient number, since it is larger than the sum of its proper divisors (31971).

19221841 is an equidigital number, since it uses as much as digits as its factorization.

19221841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31970.

The product of its digits is 1152, while the sum is 28.

The square root of 19221841 is about 4384.2720034231. The cubic root of 19221841 is about 267.8746768695.

The spelling of 19221841 in words is "nineteen million, two hundred twenty-one thousand, eight hundred forty-one".