142146221 has 16 divisors (see below), whose sum is σ = 167236608. Its totient is φ = 118281600.

The previous prime is 142146209. The next prime is 142146229. The reversal of 142146221 is 122641241.

It is a cyclic number.

It is not a de Polignac number, because 142146221 - 2⁶ = 142146157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142146229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62891 + ... + 65111.

It is an arithmetic number, because the mean of its divisors is an integer number (10452288).

Almost surely, 2^142146221 is an apocalyptic number.

It is an amenable number.

142146221 is a deficient number, since it is larger than the sum of its proper divisors (25090387).

142146221 is a wasteful number, since it uses less digits than its factorization.

142146221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492.

The product of its digits is 768, while the sum is 23.

The square root of 142146221 is about 11922.5090060775. The cubic root of 142146221 is about 521.8893559869.

Adding to 142146221 its reverse (122641241), we get a palindrome (264787462).

The spelling of 142146221 in words is "one hundred forty-two million, one hundred forty-six thousand, two hundred twenty-one".