1021143 has 4 divisors (see below), whose sum is σ = 1361528. Its totient is φ = 680760.

The previous prime is 1021129. The next prime is 1021157. The reversal of 1021143 is 3411201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3411201 = 3 ⋅1137067.

It is an interprime number because it is at equal distance from previous prime (1021129) and next prime (1021157).

It is not a de Polignac number, because 1021143 - 2⁴ = 1021127 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170188 + ... + 170193.

It is an arithmetic number, because the mean of its divisors is an integer number (340382).

2^1021143 is an apocalyptic number.

1021143 is a deficient number, since it is larger than the sum of its proper divisors (340385).

1021143 is an equidigital number, since it uses as much as digits as its factorization.

1021143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340384.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1021143 is about 1010.5162047192. The cubic root of 1021143 is about 100.6998572388.

Adding to 1021143 its reverse (3411201), we get a palindrome (4432344).

The spelling of 1021143 in words is "one million, twenty-one thousand, one hundred forty-three".