142133221 has 4 divisors (see below), whose sum is σ = 142354912. Its totient is φ = 141911532.

The previous prime is 142133219. The next prime is 142133231. The reversal of 142133221 is 122331241.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122331241 = 173 ⋅707117.

It is a cyclic number.

It is not a de Polignac number, because 142133221 - 2¹ = 142133219 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 (142133231) 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, 109881 + ... + 111166.

It is an arithmetic number, because the mean of its divisors is an integer number (35588728).

Almost surely, 2^142133221 is an apocalyptic number.

It is an amenable number.

142133221 is a deficient number, since it is larger than the sum of its proper divisors (221691).

142133221 is an equidigital number, since it uses as much as digits as its factorization.

142133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221690.

The product of its digits is 288, while the sum is 19.

The square root of 142133221 is about 11921.9638063534. The cubic root of 142133221 is about 521.8734456836.

Adding to 142133221 its reverse (122331241), we get a palindrome (264464462).

The spelling of 142133221 in words is "one hundred forty-two million, one hundred thirty-three thousand, two hundred twenty-one".