22321231 has 2 divisors, whose sum is σ = 22321232. Its totient is φ = 22321230.

The previous prime is 22321217. The next prime is 22321237. The reversal of 22321231 is 13212322.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22321231 - 2²³ = 13932623 is a prime.

It is a super-3 number, since 3×22321231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22321237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11160615 + 11160616.

It is an arithmetic number, because the mean of its divisors is an integer number (11160616).

Almost surely, 2^22321231 is an apocalyptic number.

22321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

22321231 is an equidigital number, since it uses as much as digits as its factorization.

22321231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 16.

The square root of 22321231 is about 4724.5350035744. The cubic root of 22321231 is about 281.5611393880.

Adding to 22321231 its reverse (13212322), we get a palindrome (35533553).

The spelling of 22321231 in words is "twenty-two million, three hundred twenty-one thousand, two hundred thirty-one".