22012291 has 4 divisors (see below), whose sum is σ = 25156912. Its totient is φ = 18867672.

The previous prime is 22012273. The next prime is 22012301. The reversal of 22012291 is 19221022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19221022 = 2 ⋅9610511.

It is a cyclic number.

It is not a de Polignac number, because 22012291 - 2¹⁷ = 21881219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22012231) 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, 1572300 + ... + 1572313.

It is an arithmetic number, because the mean of its divisors is an integer number (6289228).

Almost surely, 2^22012291 is an apocalyptic number.

22012291 is a deficient number, since it is larger than the sum of its proper divisors (3144621).

22012291 is an equidigital number, since it uses as much as digits as its factorization.

22012291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144620.

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

The square root of 22012291 is about 4691.7258018772. The cubic root of 22012291 is about 280.2561049652.

The spelling of 22012291 in words is "twenty-two million, twelve thousand, two hundred ninety-one".