1221223 has 2 divisors, whose sum is σ = 1221224.
Its totient is φ = 1221222.
The previous prime is 1221221. The next prime is 1221239. The reversal of 1221223 is 3221221.
Adding to 1221223 its reverse (3221221), we get a palindrome (4442444).
It can be divided in two parts, 1221 and 223, that added together give a square (1444 = 382).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1221223 - 21 = 1221221 is a prime.
Together with 1221221, 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 (1221221) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611 + 610612.
It is an arithmetic number, because the mean of its divisors is an integer number (610612).
21221223 is an apocalyptic number.
1221223 is a deficient number, since it is larger than the sum of its proper divisors (1).
1221223 is an equidigital number, since it uses as much as digits as its factorization.
1221223 is an evil number, because the sum of its binary digits is even.
The product of its digits is 48, while the sum is 13.
The square root of 1221223 is about 1105.0895891284.
The cubic root of 1221223 is about 106.8886663326.
Note that the first 3 decimals are identical.
The spelling of 1221223 in words is "one million, two hundred twenty-one thousand, two hundred twenty-three".