42012305281 has 2 divisors, whose sum is σ = 42012305282. Its totient is φ = 42012305280.

The previous prime is 42012305267. The next prime is 42012305303. The reversal of 42012305281 is 18250321024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37100538225 + 4911767056 = 192615^2 + 70084^2 .

It is a cyclic number.

It is not a de Polignac number, because 42012305281 - 2⁹ = 42012304769 is a prime.

It is a super-2 number, since 2×42012305281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42012305081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21006152640 + 21006152641.

It is an arithmetic number, because the mean of its divisors is an integer number (21006152641).

Almost surely, 2^42012305281 is an apocalyptic number.

It is an amenable number.

42012305281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42012305281 is an equidigital number, since it uses as much as digits as its factorization.

42012305281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 42012305281 in words is "forty-two billion, twelve million, three hundred five thousand, two hundred eighty-one".