211621351241 has 2 divisors, whose sum is σ = 211621351242. Its totient is φ = 211621351240.

The previous prime is 211621351189. The next prime is 211621351247. The reversal of 211621351241 is 142153126112.

It is a happy number.

211621351241 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., 116158272400 + 95463078841 = 340820^2 + 308971^2 .

It is a cyclic number.

It is not a de Polignac number, because 211621351241 - 2⁶ = 211621351177 is a prime.

It is not a weakly prime, because it can be changed into another prime (211621351247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105810675620 + 105810675621.

It is an arithmetic number, because the mean of its divisors is an integer number (105810675621).

Almost surely, 2^211621351241 is an apocalyptic number.

It is an amenable number.

211621351241 is a deficient number, since it is larger than the sum of its proper divisors (1).

211621351241 is an equidigital number, since it uses as much as digits as its factorization.

211621351241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

Adding to 211621351241 its reverse (142153126112), we get a palindrome (353774477353).

The spelling of 211621351241 in words is "two hundred eleven billion, six hundred twenty-one million, three hundred fifty-one thousand, two hundred forty-one".