211039970918449 has 2 divisors, whose sum is σ = 211039970918450. Its totient is φ = 211039970918448.

The previous prime is 211039970918393. The next prime is 211039970918453. The reversal of 211039970918449 is 944819079930112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205333280597025 + 5706690321424 = 14329455^2 + 2388868^2 .

It is a cyclic number.

It is not a de Polignac number, because 211039970918449 - 2⁷ = 211039970918321 is a prime.

It is not a weakly prime, because it can be changed into another prime (211039970918479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105519985459224 + 105519985459225.

It is an arithmetic number, because the mean of its divisors is an integer number (105519985459225).

Almost surely, 2^{211039970918449} is an apocalyptic number.

It is an amenable number.

211039970918449 is a deficient number, since it is larger than the sum of its proper divisors (1).

211039970918449 is an equidigital number, since it uses as much as digits as its factorization.

211039970918449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 67.

The spelling of 211039970918449 in words is "two hundred eleven trillion, thirty-nine billion, nine hundred seventy million, nine hundred eighteen thousand, four hundred forty-nine".