212111057 has 16 divisors (see below), whose sum is σ = 228880080. Its totient is φ = 195858432.

The previous prime is 212111051. The next prime is 212111071. The reversal of 212111057 is 750111212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 39740416 + 172370641 = 6304^2 + 13129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212111057 is a prime.

It is a super-2 number, since 2×212111057² = 89982201003314498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212111051) 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 15 ways as a sum of consecutive naturals, for example, 208883 + ... + 209895.

It is an arithmetic number, because the mean of its divisors is an integer number (14305005).

Almost surely, 2^212111057 is an apocalyptic number.

It is an amenable number.

212111057 is a deficient number, since it is larger than the sum of its proper divisors (16769023).

212111057 is a wasteful number, since it uses less digits than its factorization.

212111057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 212111057 is about 14564.0329922724. The cubic root of 212111057 is about 596.3772975863.

Adding to 212111057 its reverse (750111212), we get a palindrome (962222269).

The spelling of 212111057 in words is "two hundred twelve million, one hundred eleven thousand, fifty-seven".