142221605621 has 2 divisors, whose sum is σ = 142221605622. Its totient is φ = 142221605620.

The previous prime is 142221605579. The next prime is 142221605653. The reversal of 142221605621 is 126506122241.

142221605621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (142221605653) can be obtained adding 142221605621 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139064851396 + 3156754225 = 372914^2 + 56185^2 .

It is a cyclic number.

It is not a de Polignac number, because 142221605621 - 2²² = 142217411317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142221605321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71110802810 + 71110802811.

It is an arithmetic number, because the mean of its divisors is an integer number (71110802811).

Almost surely, 2^142221605621 is an apocalyptic number.

It is an amenable number.

142221605621 is a deficient number, since it is larger than the sum of its proper divisors (1).

142221605621 is an equidigital number, since it uses as much as digits as its factorization.

142221605621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 142221605621 its reverse (126506122241), we get a palindrome (268727727862).

The spelling of 142221605621 in words is "one hundred forty-two billion, two hundred twenty-one million, six hundred five thousand, six hundred twenty-one".