22191321 has 4 divisors (see below), whose sum is σ = 29588432. Its totient is φ = 14794212.

The previous prime is 22191287. The next prime is 22191329. The reversal of 22191321 is 12319122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22191321 - 2¹⁰ = 22190297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22191329) 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 in 3 ways as a sum of consecutive naturals, for example, 3698551 + ... + 3698556.

It is an arithmetic number, because the mean of its divisors is an integer number (7397108).

Almost surely, 2^22191321 is an apocalyptic number.

It is an amenable number.

22191321 is a deficient number, since it is larger than the sum of its proper divisors (7397111).

22191321 is an equidigital number, since it uses as much as digits as its factorization.

22191321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7397110.

The product of its digits is 216, while the sum is 21.

The square root of 22191321 is about 4710.7664981402. The cubic root of 22191321 is about 281.0138458158.

The spelling of 22191321 in words is "twenty-two million, one hundred ninety-one thousand, three hundred twenty-one".