42411221561 has 2 divisors, whose sum is σ = 42411221562. Its totient is φ = 42411221560.

The previous prime is 42411221537. The next prime is 42411221581. The reversal of 42411221561 is 16512211424.

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., 31458343225 + 10952878336 = 177365^2 + 104656^2 .

It is a cyclic number.

It is not a de Polignac number, because 42411221561 - 2¹⁸ = 42410959417 is a prime.

It is not a weakly prime, because it can be changed into another prime (42411221581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21205610780 + 21205610781.

It is an arithmetic number, because the mean of its divisors is an integer number (21205610781).

Almost surely, 2^42411221561 is an apocalyptic number.

It is an amenable number.

42411221561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42411221561 is an equidigital number, since it uses as much as digits as its factorization.

42411221561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 29.

Adding to 42411221561 its reverse (16512211424), we get a palindrome (58923432985).

The spelling of 42411221561 in words is "forty-two billion, four hundred eleven million, two hundred twenty-one thousand, five hundred sixty-one".