211200022100257 has 2 divisors, whose sum is σ = 211200022100258. Its totient is φ = 211200022100256.

The previous prime is 211200022100191. The next prime is 211200022100261. The reversal of 211200022100257 is 752001220002112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177816864370401 + 33383157729856 = 13334799^2 + 5777816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211200022100257 is a prime.

It is not a weakly prime, because it can be changed into another prime (211200022100267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600011050128 + 105600011050129.

It is an arithmetic number, because the mean of its divisors is an integer number (105600011050129).

Almost surely, 2^{211200022100257} is an apocalyptic number.

It is an amenable number.

211200022100257 is a deficient number, since it is larger than the sum of its proper divisors (1).

211200022100257 is an equidigital number, since it uses as much as digits as its factorization.

211200022100257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 211200022100257 its reverse (752001220002112), we get a palindrome (963201242102369).

The spelling of 211200022100257 in words is "two hundred eleven trillion, two hundred billion, twenty-two million, one hundred thousand, two hundred fifty-seven".