142235221 has 2 divisors, whose sum is σ = 142235222. Its totient is φ = 142235220.

The previous prime is 142235213. The next prime is 142235239. The reversal of 142235221 is 122532241.

It is a happy number.

142235221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126315121 + 15920100 = 11239^2 + 3990^2 .

It is a cyclic number.

It is not a de Polignac number, because 142235221 - 2³ = 142235213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142235192 and 142235201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142235321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71117610 + 71117611.

It is an arithmetic number, because the mean of its divisors is an integer number (71117611).

Almost surely, 2^142235221 is an apocalyptic number.

It is an amenable number.

142235221 is a deficient number, since it is larger than the sum of its proper divisors (1).

142235221 is an equidigital number, since it uses as much as digits as its factorization.

142235221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 22.

The square root of 142235221 is about 11926.2408578730. The cubic root of 142235221 is about 521.9982543259.

Adding to 142235221 its reverse (122532241), we get a palindrome (264767462).

The spelling of 142235221 in words is "one hundred forty-two million, two hundred thirty-five thousand, two hundred twenty-one".