212118457 has 2 divisors, whose sum is σ = 212118458. Its totient is φ = 212118456.

The previous prime is 212118437. The next prime is 212118493. The reversal of 212118457 is 754811212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160047801 + 52070656 = 12651^2 + 7216^2 .

It is a cyclic number.

It is not a de Polignac number, because 212118457 - 2⁷ = 212118329 is a prime.

It is not a weakly prime, because it can be changed into another prime (212118437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106059228 + 106059229.

It is an arithmetic number, because the mean of its divisors is an integer number (106059229).

Almost surely, 2^212118457 is an apocalyptic number.

It is an amenable number.

212118457 is a deficient number, since it is larger than the sum of its proper divisors (1).

212118457 is an equidigital number, since it uses as much as digits as its factorization.

212118457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 31.

The square root of 212118457 is about 14564.2870405660. The cubic root of 212118457 is about 596.3842328537.

Adding to 212118457 its reverse (754811212), we get a palindrome (966929669).

The spelling of 212118457 in words is "two hundred twelve million, one hundred eighteen thousand, four hundred fifty-seven".