142302221 has 4 divisors (see below), whose sum is σ = 142585632. Its totient is φ = 142018812.

The previous prime is 142302163. The next prime is 142302227. The reversal of 142302221 is 122203241.

142302221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 142302221 - 2¹⁰ = 142301197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142302221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142302227) 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, 140951 + ... + 141956.

It is an arithmetic number, because the mean of its divisors is an integer number (35646408).

Almost surely, 2^142302221 is an apocalyptic number.

It is an amenable number.

142302221 is a deficient number, since it is larger than the sum of its proper divisors (283411).

142302221 is an equidigital number, since it uses as much as digits as its factorization.

142302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283410.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 142302221 is about 11929.0494591983. The cubic root of 142302221 is about 522.0802040070.

Adding to 142302221 its reverse (122203241), we get a palindrome (264505462).

The spelling of 142302221 in words is "one hundred forty-two million, three hundred two thousand, two hundred twenty-one".