142229821 has 2 divisors, whose sum is σ = 142229822. Its totient is φ = 142229820.

The previous prime is 142229809. The next prime is 142229831. The reversal of 142229821 is 128922241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134328100 + 7901721 = 11590^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 142229821 - 2⁷ = 142229693 is a prime.

It is equal to p_8030983 and since 142229821 and 8030983 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142229831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71114910 + 71114911.

It is an arithmetic number, because the mean of its divisors is an integer number (71114911).

Almost surely, 2^142229821 is an apocalyptic number.

It is an amenable number.

142229821 is a deficient number, since it is larger than the sum of its proper divisors (1).

142229821 is an equidigital number, since it uses as much as digits as its factorization.

142229821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 142229821 is about 11926.0144641871. The cubic root of 142229821 is about 521.9916483057.

The spelling of 142229821 in words is "one hundred forty-two million, two hundred twenty-nine thousand, eight hundred twenty-one".