142241221 has 4 divisors (see below), whose sum is σ = 142612992. Its totient is φ = 141869452.

The previous prime is 142241213. The next prime is 142241243. The reversal of 142241221 is 122142241.

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 a cyclic number.

It is not a de Polignac number, because 142241221 - 2³ = 142241213 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 (142241521) 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, 185311 + ... + 186076.

It is an arithmetic number, because the mean of its divisors is an integer number (35653248).

Almost surely, 2^142241221 is an apocalyptic number.

It is an amenable number.

142241221 is a deficient number, since it is larger than the sum of its proper divisors (371771).

142241221 is an equidigital number, since it uses as much as digits as its factorization.

142241221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371770.

The product of its digits is 256, while the sum is 19.

The square root of 142241221 is about 11926.4924013727. The cubic root of 142241221 is about 522.0055941523.

Adding to 142241221 its reverse (122142241), we get a palindrome (264383462).

The spelling of 142241221 in words is "one hundred forty-two million, two hundred forty-one thousand, two hundred twenty-one".