142221202421 has 2 divisors, whose sum is σ = 142221202422. Its totient is φ = 142221202420.

The previous prime is 142221202271. The next prime is 142221202423. The reversal of 142221202421 is 124202122241.

142221202421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81818309521 + 60402892900 = 286039^2 + 245770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142221202421 is a prime.

It is a super-2 number, since 2×142221202421² (a number of 23 digits) contains 22 as substring.

Together with 142221202423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142221202423) 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, 71110601210 + 71110601211.

It is an arithmetic number, because the mean of its divisors is an integer number (71110601211).

Almost surely, 2^142221202421 is an apocalyptic number.

It is an amenable number.

142221202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

142221202421 is an equidigital number, since it uses as much as digits as its factorization.

142221202421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 142221202421 its reverse (124202122241), we get a palindrome (266423324662).

The spelling of 142221202421 in words is "one hundred forty-two billion, two hundred twenty-one million, two hundred two thousand, four hundred twenty-one".