212021237 has 2 divisors, whose sum is σ = 212021238. Its totient is φ = 212021236.

The previous prime is 212021213. The next prime is 212021239. The reversal of 212021237 is 732120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195748081 + 16273156 = 13991^2 + 4034^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021237 - 2¹⁰ = 212020213 is a prime.

Together with 212021239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010618 + 106010619.

It is an arithmetic number, because the mean of its divisors is an integer number (106010619).

Almost surely, 2^212021237 is an apocalyptic number.

It is an amenable number.

212021237 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021237 is an equidigital number, since it uses as much as digits as its factorization.

212021237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 212021237 is about 14560.9490418722. The cubic root of 212021237 is about 596.2931055716.

Adding to 212021237 its reverse (732120212), we get a palindrome (944141449).

The spelling of 212021237 in words is "two hundred twelve million, twenty-one thousand, two hundred thirty-seven".