142204421 has 2 divisors, whose sum is σ = 142204422. Its totient is φ = 142204420.

The previous prime is 142204411. The next prime is 142204451. The reversal of 142204421 is 124402241.

142204421 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., 105165025 + 37039396 = 10255^2 + 6086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142204421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142204393 and 142204402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142204411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71102210 + 71102211.

It is an arithmetic number, because the mean of its divisors is an integer number (71102211).

Almost surely, 2^142204421 is an apocalyptic number.

It is an amenable number.

142204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

142204421 is an equidigital number, since it uses as much as digits as its factorization.

142204421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 142204421 is about 11924.9495177129. The cubic root of 142204421 is about 521.9605733007.

Adding to 142204421 its reverse (124402241), we get a palindrome (266606662).

The spelling of 142204421 in words is "one hundred forty-two million, two hundred four thousand, four hundred twenty-one".