212117057 has 4 divisors (see below), whose sum is σ = 212841300. Its totient is φ = 211392816.

The previous prime is 212117053. The next prime is 212117111. The reversal of 212117057 is 750711212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108972721 + 103144336 = 10439^2 + 10156^2 .

It is a cyclic number.

It is not a de Polignac number, because 212117057 - 2² = 212117053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212117053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361682 + ... + 362267.

It is an arithmetic number, because the mean of its divisors is an integer number (53210325).

Almost surely, 2^212117057 is an apocalyptic number.

It is an amenable number.

212117057 is a deficient number, since it is larger than the sum of its proper divisors (724243).

212117057 is an equidigital number, since it uses as much as digits as its factorization.

212117057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724242.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 212117057 is about 14564.2389777152. The cubic root of 212117057 is about 596.3829207885.

Adding to 212117057 its reverse (750711212), we get a palindrome (962828269).

The spelling of 212117057 in words is "two hundred twelve million, one hundred seventeen thousand, fifty-seven".