142112021221 has 2 divisors, whose sum is σ = 142112021222. Its totient is φ = 142112021220.

The previous prime is 142112021143. The next prime is 142112021231. The reversal of 142112021221 is 122120211241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138301428321 + 3810592900 = 371889^2 + 61730^2 .

It is a cyclic number.

It is not a de Polignac number, because 142112021221 - 2²⁹ = 141575150309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142112021231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71056010610 + 71056010611.

It is an arithmetic number, because the mean of its divisors is an integer number (71056010611).

Almost surely, 2^142112021221 is an apocalyptic number.

It is an amenable number.

142112021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

142112021221 is an equidigital number, since it uses as much as digits as its factorization.

142112021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 142112021221 its reverse (122120211241), we get a palindrome (264232232462).

The spelling of 142112021221 in words is "one hundred forty-two billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".