142203221 has 8 divisors (see below), whose sum is σ = 144731160. Its totient is φ = 139696128.

The previous prime is 142203209. The next prime is 142203223. The reversal of 142203221 is 122302241.

It can be written as a sum of positive squares in 4 ways, for example, as 5640625 + 136562596 = 2375^2 + 11686^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142203221 - 2²² = 138008917 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 142203221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142203223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8885 + ... + 19061.

It is an arithmetic number, because the mean of its divisors is an integer number (18091395).

Almost surely, 2^142203221 is an apocalyptic number.

It is an amenable number.

142203221 is a deficient number, since it is larger than the sum of its proper divisors (2527939).

142203221 is a wasteful number, since it uses less digits than its factorization.

142203221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10423.

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

The square root of 142203221 is about 11924.8992029283. The cubic root of 142203221 is about 521.9591050986.

Adding to 142203221 its reverse (122302241), we get a palindrome (264505462).

The spelling of 142203221 in words is "one hundred forty-two million, two hundred three thousand, two hundred twenty-one".