211900511903257 has 2 divisors, whose sum is σ = 211900511903258. Its totient is φ = 211900511903256.

The previous prime is 211900511903203. The next prime is 211900511903261. The reversal of 211900511903257 is 752309115009112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116679293708761 + 95221218194496 = 10801819^2 + 9758136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211900511903257 is a prime.

It is not a weakly prime, because it can be changed into another prime (211900511903557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105950255951628 + 105950255951629.

It is an arithmetic number, because the mean of its divisors is an integer number (105950255951629).

Almost surely, 2^{211900511903257} is an apocalyptic number.

It is an amenable number.

211900511903257 is a deficient number, since it is larger than the sum of its proper divisors (1).

211900511903257 is an equidigital number, since it uses as much as digits as its factorization.

211900511903257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 46.

The spelling of 211900511903257 in words is "two hundred eleven trillion, nine hundred billion, five hundred eleven million, nine hundred three thousand, two hundred fifty-seven".