242142541405421 has 2 divisors, whose sum is σ = 242142541405422. Its totient is φ = 242142541405420.

The previous prime is 242142541405411. The next prime is 242142541405463. The reversal of 242142541405421 is 124504145241242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179186870044900 + 62955671360521 = 13386070^2 + 7934461^2 .

It is a cyclic number.

It is not a de Polignac number, because 242142541405421 - 2⁶ = 242142541405357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242142541405411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121071270702710 + 121071270702711.

It is an arithmetic number, because the mean of its divisors is an integer number (121071270702711).

Almost surely, 2^{242142541405421} is an apocalyptic number.

It is an amenable number.

242142541405421 is a deficient number, since it is larger than the sum of its proper divisors (1).

242142541405421 is an equidigital number, since it uses as much as digits as its factorization.

242142541405421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 409600, while the sum is 41.

Adding to 242142541405421 its reverse (124504145241242), we get a palindrome (366646686646663).

The spelling of 242142541405421 in words is "two hundred forty-two trillion, one hundred forty-two billion, five hundred forty-one million, four hundred five thousand, four hundred twenty-one".