42211261 has 2 divisors, whose sum is σ = 42211262. Its totient is φ = 42211260.

The previous prime is 42211259. The next prime is 42211297. The reversal of 42211261 is 16211224.

42211261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26163225 + 16048036 = 5115^2 + 4006^2 .

It is a cyclic number.

It is not a de Polignac number, because 42211261 - 2¹ = 42211259 is a prime.

Together with 42211259, 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 (42211361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21105630 + 21105631.

It is an arithmetic number, because the mean of its divisors is an integer number (21105631).

Almost surely, 2^42211261 is an apocalyptic number.

It is an amenable number.

42211261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42211261 is an equidigital number, since it uses as much as digits as its factorization.

42211261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 42211261 is about 6497.0193935373. The cubic root of 42211261 is about 348.1845065761.

Adding to 42211261 its reverse (16211224), we get a palindrome (58422485).

The spelling of 42211261 in words is "forty-two million, two hundred eleven thousand, two hundred sixty-one".