142222221 has 12 divisors (see below), whose sum is σ = 217516572. Its totient is φ = 89237376.

The previous prime is 142222211. The next prime is 142222231. The reversal of 142222221 is 122222241.

142222221 is a `hidden beast` number, since 1 + 422 + 22 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (142222211) and next prime (142222231).

It can be written as a sum of positive squares in 2 ways, for example, as 93026025 + 49196196 = 9645^2 + 7014^2 .

It is not a de Polignac number, because 142222221 - 2⁵ = 142222189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142222194 and 142222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 464626 + ... + 464931.

It is an arithmetic number, because the mean of its divisors is an integer number (18126381).

Almost surely, 2^142222221 is an apocalyptic number.

It is an amenable number.

142222221 is a deficient number, since it is larger than the sum of its proper divisors (75294351).

142222221 is a wasteful number, since it uses less digits than its factorization.

142222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929580 (or 929577 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 142222221 is about 11925.6958287557. The cubic root of 142222221 is about 521.9823506606.

Adding to 142222221 its reverse (122222241), we get a palindrome (264444462).

The spelling of 142222221 in words is "one hundred forty-two million, two hundred twenty-two thousand, two hundred twenty-one".