142231021 has 2 divisors, whose sum is σ = 142231022. Its totient is φ = 142231020.

The previous prime is 142231013. The next prime is 142231039. The reversal of 142231021 is 120132241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82555396 + 59675625 = 9086^2 + 7725^2 .

It is a cyclic number.

It is not a de Polignac number, because 142231021 - 2³ = 142231013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142230986 and 142231004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142231081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71115510 + 71115511.

It is an arithmetic number, because the mean of its divisors is an integer number (71115511).

Almost surely, 2^142231021 is an apocalyptic number.

It is an amenable number.

142231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

142231021 is an equidigital number, since it uses as much as digits as its factorization.

142231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 142231021 is about 11926.0647742665. The cubic root of 142231021 is about 521.9931163246.

Adding to 142231021 its reverse (120132241), we get a palindrome (262363262).

The spelling of 142231021 in words is "one hundred forty-two million, two hundred thirty-one thousand, twenty-one".