1142206321 has 4 divisors (see below), whose sum is σ = 1142518644. Its totient is φ = 1141894000.

The previous prime is 1142206301. The next prime is 1142206333. The reversal of 1142206321 is 1236022411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 299117025 + 843089296 = 17295^2 + 29036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142206321 - 2¹⁹ = 1141682033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1142206292 and 1142206301.

It is not an unprimeable number, because it can be changed into a prime (1142206301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150610 + ... + 158011.

It is an arithmetic number, because the mean of its divisors is an integer number (285629661).

Almost surely, 2^1142206321 is an apocalyptic number.

It is an amenable number.

1142206321 is a deficient number, since it is larger than the sum of its proper divisors (312323).

1142206321 is an equidigital number, since it uses as much as digits as its factorization.

1142206321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312322.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1142206321 is about 33796.5430332749. The cubic root of 1142206321 is about 1045.3174164531.

Adding to 1142206321 its reverse (1236022411), we get a palindrome (2378228732).

The spelling of 1142206321 in words is "one billion, one hundred forty-two million, two hundred six thousand, three hundred twenty-one".