211340457 has 6 divisors (see below), whose sum is σ = 305269562. Its totient is φ = 140893632.

The previous prime is 211340453. The next prime is 211340471. The reversal of 211340457 is 754043112.

It can be written as a sum of positive squares in only one way, i.e., 208831401 + 2509056 = 14451^2 + 1584^2 .

It is not a de Polignac number, because 211340457 - 2² = 211340453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211340457.

It is not an unprimeable number, because it can be changed into a prime (211340453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11741128 + ... + 11741145.

Almost surely, 2^211340457 is an apocalyptic number.

It is an amenable number.

211340457 is a deficient number, since it is larger than the sum of its proper divisors (93929105).

211340457 is a wasteful number, since it uses less digits than its factorization.

211340457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23482279 (or 23482276 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 211340457 is about 14537.5533361016. The cubic root of 211340457 is about 595.6542078118.

Adding to 211340457 its reverse (754043112), we get a palindrome (965383569).

The spelling of 211340457 in words is "two hundred eleven million, three hundred forty thousand, four hundred fifty-seven".