211440401 has 2 divisors, whose sum is σ = 211440402. Its totient is φ = 211440400.

The previous prime is 211440377. The next prime is 211440413. The reversal of 211440401 is 104044112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194630401 + 16810000 = 13951^2 + 4100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211440401 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211440401.

It is not a weakly prime, because it can be changed into another prime (211440431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105720200 + 105720201.

It is an arithmetic number, because the mean of its divisors is an integer number (105720201).

Almost surely, 2^211440401 is an apocalyptic number.

It is an amenable number.

211440401 is a deficient number, since it is larger than the sum of its proper divisors (1).

211440401 is an equidigital number, since it uses as much as digits as its factorization.

211440401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211440401 is about 14540.9903720483. The cubic root of 211440401 is about 595.7480890041.

Adding to 211440401 its reverse (104044112), we get a palindrome (315484513).

The spelling of 211440401 in words is "two hundred eleven million, four hundred forty thousand, four hundred one".