424243242342421 has 2 divisors, whose sum is σ = 424243242342422. Its totient is φ = 424243242342420.

The previous prime is 424243242342391. The next prime is 424243242342443. The reversal of 424243242342421 is 124243242342424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387904408793521 + 36338833548900 = 19695289^2 + 6028170^2 .

It is a cyclic number.

It is not a de Polignac number, because 424243242342421 - 2⁹ = 424243242341909 is a prime.

It is a super-2 number, since 2×424243242342421² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424243242342481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212121621171210 + 212121621171211.

It is an arithmetic number, because the mean of its divisors is an integer number (212121621171211).

Almost surely, 2^{424243242342421} is an apocalyptic number.

It is an amenable number.

424243242342421 is a deficient number, since it is larger than the sum of its proper divisors (1).

424243242342421 is an equidigital number, since it uses as much as digits as its factorization.

424243242342421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2359296, while the sum is 43.

Adding to 424243242342421 its reverse (124243242342424), we get a palindrome (548486484684845).

The spelling of 424243242342421 in words is "four hundred twenty-four trillion, two hundred forty-three billion, two hundred forty-two million, three hundred forty-two thousand, four hundred twenty-one".