42112213261 has 2 divisors, whose sum is σ = 42112213262. Its totient is φ = 42112213260.

The previous prime is 42112213259. The next prime is 42112213303. The reversal of 42112213261 is 16231221124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31274154025 + 10838059236 = 176845^2 + 104106^2 .

It is a cyclic number.

It is not a de Polignac number, because 42112213261 - 2¹ = 42112213259 is a prime.

Together with 42112213259, 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 (42112213061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21056106630 + 21056106631.

It is an arithmetic number, because the mean of its divisors is an integer number (21056106631).

Almost surely, 2^42112213261 is an apocalyptic number.

It is an amenable number.

42112213261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42112213261 is an equidigital number, since it uses as much as digits as its factorization.

42112213261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

Adding to 42112213261 its reverse (16231221124), we get a palindrome (58343434385).

The spelling of 42112213261 in words is "forty-two billion, one hundred twelve million, two hundred thirteen thousand, two hundred sixty-one".