22563421 has 4 divisors (see below), whose sum is σ = 23341500. Its totient is φ = 21785344.

The previous prime is 22563419. The next prime is 22563449. The reversal of 22563421 is 12436522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3944196 + 18619225 = 1986^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 22563421 - 2¹ = 22563419 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 (22563481) 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, 388996 + ... + 389053.

It is an arithmetic number, because the mean of its divisors is an integer number (5835375).

Almost surely, 2^22563421 is an apocalyptic number.

It is an amenable number.

22563421 is a deficient number, since it is larger than the sum of its proper divisors (778079).

22563421 is an equidigital number, since it uses as much as digits as its factorization.

22563421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778078.

The product of its digits is 2880, while the sum is 25.

The square root of 22563421 is about 4750.0969463791. The cubic root of 22563421 is about 282.5758107030.

Adding to 22563421 its reverse (12436522), we get a palindrome (34999943).

The spelling of 22563421 in words is "twenty-two million, five hundred sixty-three thousand, four hundred twenty-one".