211340557 has 8 divisors (see below), whose sum is σ = 215163000. Its totient is φ = 207550464.

The previous prime is 211340543. The next prime is 211340567. The reversal of 211340557 is 755043112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2653641 + 208686916 = 1629^2 + 14446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211340557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211340567) 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 7 ways as a sum of consecutive naturals, for example, 5293 + ... + 21229.

It is an arithmetic number, because the mean of its divisors is an integer number (26895375).

Almost surely, 2^211340557 is an apocalyptic number.

It is an amenable number.

211340557 is a deficient number, since it is larger than the sum of its proper divisors (3822443).

211340557 is a wasteful number, since it uses less digits than its factorization.

211340557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16175.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 211340557 is about 14537.5567754695. The cubic root of 211340557 is about 595.6543017603.

Adding to 211340557 its reverse (755043112), we get a palindrome (966383669).

The spelling of 211340557 in words is "two hundred eleven million, three hundred forty thousand, five hundred fifty-seven".