22220591 has 4 divisors (see below), whose sum is σ = 22230072. Its totient is φ = 22211112.

The previous prime is 22220537. The next prime is 22220603. The reversal of 22220591 is 19502222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19502222 = 2 ⋅9751111.

It is a cyclic number.

It is not a de Polignac number, because 22220591 - 2¹⁴ = 22204207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220791) 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, 1625 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (5557518).

Almost surely, 2^22220591 is an apocalyptic number.

22220591 is a deficient number, since it is larger than the sum of its proper divisors (9481).

22220591 is an equidigital number, since it uses as much as digits as its factorization.

22220591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 22220591 is about 4713.8721874909. The cubic root of 22220591 is about 281.1373424684.

The spelling of 22220591 in words is "twenty-two million, two hundred twenty thousand, five hundred ninety-one".