22423023421 has 2 divisors, whose sum is σ = 22423023422. Its totient is φ = 22423023420.

The previous prime is 22423023419. The next prime is 22423023439. The reversal of 22423023421 is 12432032422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12833717796 + 9589305625 = 113286^2 + 97925^2 .

It is a cyclic number.

It is not a de Polignac number, because 22423023421 - 2¹ = 22423023419 is a prime.

Together with 22423023419, 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 (22423026421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11211511710 + 11211511711.

It is an arithmetic number, because the mean of its divisors is an integer number (11211511711).

Almost surely, 2^22423023421 is an apocalyptic number.

It is an amenable number.

22423023421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22423023421 is an equidigital number, since it uses as much as digits as its factorization.

22423023421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 22423023421 its reverse (12432032422), we get a palindrome (34855055843).

Subtracting from 22423023421 its reverse (12432032422), we obtain a palindrome (9990990999).

The spelling of 22423023421 in words is "twenty-two billion, four hundred twenty-three million, twenty-three thousand, four hundred twenty-one".