42140252261 has 2 divisors, whose sum is σ = 42140252262. Its totient is φ = 42140252260.

The previous prime is 42140252249. The next prime is 42140252267. The reversal of 42140252261 is 16225204124.

42140252261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25879156900 + 16261095361 = 160870^2 + 127519^2 .

It is a cyclic number.

It is not a de Polignac number, because 42140252261 - 2⁶ = 42140252197 is a prime.

It is a super-2 number, since 2×42140252261² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42140252267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21070126130 + 21070126131.

It is an arithmetic number, because the mean of its divisors is an integer number (21070126131).

Almost surely, 2^42140252261 is an apocalyptic number.

It is an amenable number.

42140252261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42140252261 is an equidigital number, since it uses as much as digits as its factorization.

42140252261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 42140252261 its reverse (16225204124), we get a palindrome (58365456385).

The spelling of 42140252261 in words is "forty-two billion, one hundred forty million, two hundred fifty-two thousand, two hundred sixty-one".