22231421 has 2 divisors, whose sum is σ = 22231422. Its totient is φ = 22231420.

The previous prime is 22231403. The next prime is 22231439. The reversal of 22231421 is 12413222.

It is a balanced prime because it is at equal distance from previous prime (22231403) and next prime (22231439).

It can be written as a sum of positive squares in only one way, i.e., 22231225 + 196 = 4715^2 + 14^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22231421 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22231421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22231441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11115710 + 11115711.

It is an arithmetic number, because the mean of its divisors is an integer number (11115711).

Almost surely, 2^22231421 is an apocalyptic number.

It is an amenable number.

22231421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22231421 is an equidigital number, since it uses as much as digits as its factorization.

22231421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 22231421 is about 4715.0207846838. The cubic root of 22231421 is about 281.1830091641.

Adding to 22231421 its reverse (12413222), we get a palindrome (34644643).

The spelling of 22231421 in words is "twenty-two million, two hundred thirty-one thousand, four hundred twenty-one".