22536421 has 2 divisors, whose sum is σ = 22536422. Its totient is φ = 22536420.

The previous prime is 22536419. The next prime is 22536427. The reversal of 22536421 is 12463522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14062500 + 8473921 = 3750^2 + 2911^2 .

It is a cyclic number.

It is not a de Polignac number, because 22536421 - 2¹ = 22536419 is a prime.

Together with 22536419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22536427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11268210 + 11268211.

It is an arithmetic number, because the mean of its divisors is an integer number (11268211).

Almost surely, 2^22536421 is an apocalyptic number.

It is an amenable number.

22536421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22536421 is an equidigital number, since it uses as much as digits as its factorization.

22536421 is an evil number, because the sum of its binary digits is even.

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

The square root of 22536421 is about 4747.2540483947. The cubic root of 22536421 is about 282.4630530948.

Adding to 22536421 its reverse (12463522), we get a palindrome (34999943).

The spelling of 22536421 in words is "twenty-two million, five hundred thirty-six thousand, four hundred twenty-one".