242405542021 has 2 divisors, whose sum is σ = 242405542022. Its totient is φ = 242405542020.

The previous prime is 242405542019. The next prime is 242405542087. The reversal of 242405542021 is 120245504242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195355160100 + 47050381921 = 441990^2 + 216911^2 .

It is a cyclic number.

It is not a de Polignac number, because 242405542021 - 2¹ = 242405542019 is a prime.

Together with 242405542019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242405572021) 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, 121202771010 + 121202771011.

It is an arithmetic number, because the mean of its divisors is an integer number (121202771011).

Almost surely, 2^242405542021 is an apocalyptic number.

It is an amenable number.

242405542021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242405542021 is an equidigital number, since it uses as much as digits as its factorization.

242405542021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25600, while the sum is 31.

The spelling of 242405542021 in words is "two hundred forty-two billion, four hundred five million, five hundred forty-two thousand, twenty-one".