211001209957 has 2 divisors, whose sum is σ = 211001209958. Its totient is φ = 211001209956.

The previous prime is 211001209919. The next prime is 211001209961. The reversal of 211001209957 is 759902100112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191691606276 + 19309603681 = 437826^2 + 138959^2 .

It is a cyclic number.

It is not a de Polignac number, because 211001209957 - 2⁷ = 211001209829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211001209987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105500604978 + 105500604979.

It is an arithmetic number, because the mean of its divisors is an integer number (105500604979).

Almost surely, 2^211001209957 is an apocalyptic number.

It is an amenable number.

211001209957 is a deficient number, since it is larger than the sum of its proper divisors (1).

211001209957 is an equidigital number, since it uses as much as digits as its factorization.

211001209957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 37.

The spelling of 211001209957 in words is "two hundred eleven billion, one million, two hundred nine thousand, nine hundred fifty-seven".