1142144021 has 2 divisors, whose sum is σ = 1142144022. Its totient is φ = 1142144020.

The previous prime is 1142143987. The next prime is 1142144023. The reversal of 1142144021 is 1204412411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935503396 + 206640625 = 30586^2 + 14375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142144021 - 2¹⁸ = 1141881877 is a prime.

It is a Sophie Germain prime.

Together with 1142144023, it forms a pair of twin primes.

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 = 1142143984 and 1142144002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142144023) 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 as a sum of consecutive naturals, namely, 571072010 + 571072011.

It is an arithmetic number, because the mean of its divisors is an integer number (571072011).

Almost surely, 2^1142144021 is an apocalyptic number.

It is an amenable number.

1142144021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142144021 is an equidigital number, since it uses as much as digits as its factorization.

1142144021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1142144021 is about 33795.6213288053. The cubic root of 1142144021 is about 1045.2984109962.

Adding to 1142144021 its reverse (1204412411), we get a palindrome (2346556432).

The spelling of 1142144021 in words is "one billion, one hundred forty-two million, one hundred forty-four thousand, twenty-one".