1011221 has 2 divisors, whose sum is σ = 1011222.
Its totient is φ = 1011220.
The previous prime is 1011217. The next prime is 1011229. The reversal of 1011221 is 1221101.
It is an a-pointer prime, because the next prime (1011229) can be obtained adding 1011221 to its sum of digits (8).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 790321 + 220900 = 889^2 + 470^2
It is a cyclic number.
It is not a de Polignac number, because 1011221 - 22 = 1011217 is a prime.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 1011199 and 1011208.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1011229) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610 + 505611.
It is an arithmetic number, because the mean of its divisors is an integer number (505611).
21011221 is an apocalyptic number.
It is an amenable number.
1011221 is a deficient number, since it is larger than the sum of its proper divisors (1).
1011221 is an equidigital number, since it uses as much as digits as its factorization.
1011221 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 4, while the sum is 8.
The square root of 1011221 is about 1005.5948488333.
The cubic root of 1011221 is about 100.3726429805.
Adding to 1011221 its reverse (1221101), we get a palindrome (2232322).
It can be divided in two parts, 101 and 1221, that multiplied together give a palindrome (123321).
The spelling of 1011221 in words is "one million, eleven thousand, two hundred twenty-one".