22231331 has 2 divisors, whose sum is σ = 22231332.
Its totient is φ = 22231330.
The previous prime is 22231241. The next prime is 22231351. The reversal of 22231331 is 13313222.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 22231331 - 214 = 22214947 is a prime.
It is a super-2 number, since 2×222313312 = 988464156063122, which contains 22 as substring.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (22231351) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11115665 + 11115666.
It is an arithmetic number, because the mean of its divisors is an integer number (11115666).
Almost surely, 222231331 is an apocalyptic number.
22231331 is a deficient number, since it is larger than the sum of its proper divisors (1).
22231331 is an equidigital number, since it uses as much as digits as its factorization.
22231331 is an evil number, because the sum of its binary digits is even.
The product of its digits is 216, while the sum is 17.
The square root of 22231331 is about 4715.0112407077.
The cubic root of 22231331 is about 281.1826297236.
Adding to 22231331 its reverse (13313222), we get a palindrome (35544553).
The spelling of 22231331 in words is "twenty-two million, two hundred thirty-one thousand, three hundred thirty-one".