212542277 has 2 divisors, whose sum is σ = 212542278. Its totient is φ = 212542276.

The previous prime is 212542217. The next prime is 212542283. The reversal of 212542277 is 772245212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179720836 + 32821441 = 13406^2 + 5729^2 .

It is a cyclic number.

It is not a de Polignac number, because 212542277 - 2⁸ = 212542021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212542207) 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 as a sum of consecutive naturals, namely, 106271138 + 106271139.

It is an arithmetic number, because the mean of its divisors is an integer number (106271139).

Almost surely, 2^212542277 is an apocalyptic number.

It is an amenable number.

212542277 is a deficient number, since it is larger than the sum of its proper divisors (1).

212542277 is an equidigital number, since it uses as much as digits as its factorization.

212542277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 32.

The square root of 212542277 is about 14578.8297541332. The cubic root of 212542277 is about 596.7811673700.

Adding to 212542277 its reverse (772245212), we get a palindrome (984787489).

The spelling of 212542277 in words is "two hundred twelve million, five hundred forty-two thousand, two hundred seventy-seven".