142213217 has 2 divisors, whose sum is σ = 142213218. Its totient is φ = 142213216.

The previous prime is 142213153. The next prime is 142213219. The reversal of 142213217 is 712312241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82011136 + 60202081 = 9056^2 + 7759^2 .

It is a cyclic number.

It is not a de Polignac number, because 142213217 - 2⁶ = 142213153 is a prime.

Together with 142213219, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 142213192 and 142213201.

It is not a weakly prime, because it can be changed into another prime (142213219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71106608 + 71106609.

It is an arithmetic number, because the mean of its divisors is an integer number (71106609).

Almost surely, 2^142213217 is an apocalyptic number.

It is an amenable number.

142213217 is a deficient number, since it is larger than the sum of its proper divisors (1).

142213217 is an equidigital number, since it uses as much as digits as its factorization.

142213217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 142213217 is about 11925.3183186027. The cubic root of 142213217 is about 521.9713349692.

Adding to 142213217 its reverse (712312241), we get a palindrome (854525458).

The spelling of 142213217 in words is "one hundred forty-two million, two hundred thirteen thousand, two hundred seventeen".