142143321 has 4 divisors (see below), whose sum is σ = 189524432. Its totient is φ = 94762212.

The previous prime is 142143317. The next prime is 142143329. The reversal of 142143321 is 123341241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 142143321 - 2² = 142143317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142143329) 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, 23690551 + ... + 23690556.

It is an arithmetic number, because the mean of its divisors is an integer number (47381108).

Almost surely, 2^142143321 is an apocalyptic number.

It is an amenable number.

142143321 is a deficient number, since it is larger than the sum of its proper divisors (47381111).

142143321 is an equidigital number, since it uses as much as digits as its factorization.

142143321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47381110.

The product of its digits is 576, while the sum is 21.

The square root of 142143321 is about 11922.3873867611. The cubic root of 142143321 is about 521.8858068495.

Adding to 142143321 its reverse (123341241), we get a palindrome (265484562).

The spelling of 142143321 in words is "one hundred forty-two million, one hundred forty-three thousand, three hundred twenty-one".