142221251 has 16 divisors (see below), whose sum is σ = 155366400. Its totient is φ = 129729600.

The previous prime is 142221227. The next prime is 142221257. The reversal of 142221251 is 152122241.

It is a cyclic number.

It is not a de Polignac number, because 142221251 - 2⁶ = 142221187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142221257) 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, 60386 + ... + 62696.

It is an arithmetic number, because the mean of its divisors is an integer number (9710400).

Almost surely, 2^142221251 is an apocalyptic number.

142221251 is a deficient number, since it is larger than the sum of its proper divisors (13145149).

142221251 is a wasteful number, since it uses less digits than its factorization.

142221251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450.

The product of its digits is 320, while the sum is 20.

The square root of 142221251 is about 11925.6551601998. The cubic root of 142221251 is about 521.9811639636.

Adding to 142221251 its reverse (152122241), we get a palindrome (294343492).

The spelling of 142221251 in words is "one hundred forty-two million, two hundred twenty-one thousand, two hundred fifty-one".