1142021 has 2 divisors, whose sum is σ = 1142022.
Its totient is φ = 1142020.
The previous prime is 1142017. The next prime is 1142039. The reversal of 1142021 is 1202411.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1079521 + 62500 = 1039^2 + 250^2
It is a cyclic number.
It is not a de Polignac number, because 1142021 - 22 = 1142017 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 1141993 and 1142011.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1142041) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571010 + 571011.
It is an arithmetic number, because the mean of its divisors is an integer number (571011).
21142021 is an apocalyptic number.
It is an amenable number.
1142021 is a deficient number, since it is larger than the sum of its proper divisors (1).
1142021 is an equidigital number, since it uses as much as digits as its factorization.
1142021 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 16, while the sum is 11.
The square root of 1142021 is about 1068.6538260821.
The cubic root of 1142021 is about 104.5260879748.
Adding to 1142021 its reverse (1202411), we get a palindrome (2344432).
The spelling of 1142021 in words is "one million, one hundred forty-two thousand, twenty-one".