1121221 has 2 divisors, whose sum is σ = 1121222.
Its totient is φ = 1121220.
The previous prime is 1121203. The next prime is 1121231. The reversal of 1121221 is 1221211.
It is an a-pointer prime, because the next prime (1121231) can be obtained adding 1121221 to its sum of digits (10).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1028196 + 93025 = 1014^2 + 305^2
It is a cyclic number.
It is not a de Polignac number, because 1121221 - 25 = 1121189 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 1121198 and 1121207.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1121231) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560610 + 560611.
It is an arithmetic number, because the mean of its divisors is an integer number (560611).
21121221 is an apocalyptic number.
It is an amenable number.
1121221 is a deficient number, since it is larger than the sum of its proper divisors (1).
1121221 is an equidigital number, since it uses as much as digits as its factorization.
1121221 is an evil number, because the sum of its binary digits is even.
The product of its digits is 8, while the sum is 10.
The square root of 1121221 is about 1058.8772355660.
The cubic root of 1121221 is about 103.8876066368.
Subtracting from 1121221 its sum of digits (10), we obtain a palindrome (1121211).
Adding to 1121221 its reverse (1221211), we get a palindrome (2342432).
The spelling of 1121221 in words is "one million, one hundred twenty-one thousand, two hundred twenty-one".