142340221 has 8 divisors (see below), whose sum is σ = 146765880. Its totient is φ = 137945088.

The previous prime is 142340213. The next prime is 142340257. The reversal of 142340221 is 122043241.

It can be written as a sum of positive squares in 4 ways, for example, as 42120100 + 100220121 = 6490^2 + 10011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142340221 - 2³ = 142340213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142340021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2025 + ... + 16993.

It is an arithmetic number, because the mean of its divisors is an integer number (18345735).

Almost surely, 2^142340221 is an apocalyptic number.

It is an amenable number.

142340221 is a deficient number, since it is larger than the sum of its proper divisors (4425659).

142340221 is a wasteful number, since it uses less digits than its factorization.

142340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15263.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 142340221 is about 11930.6421034243. The cubic root of 142340221 is about 522.1266714993.

Adding to 142340221 its reverse (122043241), we get a palindrome (264383462).

The spelling of 142340221 in words is "one hundred forty-two million, three hundred forty thousand, two hundred twenty-one".