211121257 has 2 divisors, whose sum is σ = 211121258. Its totient is φ = 211121256.

The previous prime is 211121243. The next prime is 211121299. The reversal of 211121257 is 752121112.

211121257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185477161 + 25644096 = 13619^2 + 5064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211121257 is a prime.

It is not a weakly prime, because it can be changed into another prime (211121237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560628 + 105560629.

It is an arithmetic number, because the mean of its divisors is an integer number (105560629).

Almost surely, 2^211121257 is an apocalyptic number.

It is an amenable number.

211121257 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121257 is an equidigital number, since it uses as much as digits as its factorization.

211121257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 22.

The square root of 211121257 is about 14530.0122849225. The cubic root of 211121257 is about 595.4482012395.

Adding to 211121257 its reverse (752121112), we get a palindrome (963242369).

The spelling of 211121257 in words is "two hundred eleven million, one hundred twenty-one thousand, two hundred fifty-seven".