213122237 has 2 divisors, whose sum is σ = 213122238. Its totient is φ = 213122236.

The previous prime is 213122213. The next prime is 213122281. The reversal of 213122237 is 732221312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124121881 + 89000356 = 11141^2 + 9434^2 .

It is a cyclic number.

It is not a de Polignac number, because 213122237 - 2¹⁰ = 213121213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213122137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561118 + 106561119.

It is an arithmetic number, because the mean of its divisors is an integer number (106561119).

Almost surely, 2^213122237 is an apocalyptic number.

It is an amenable number.

213122237 is a deficient number, since it is larger than the sum of its proper divisors (1).

213122237 is an equidigital number, since it uses as much as digits as its factorization.

213122237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 213122237 is about 14598.7066892927. The cubic root of 213122237 is about 597.3234828094.

Adding to 213122237 its reverse (732221312), we get a palindrome (945343549).

The spelling of 213122237 in words is "two hundred thirteen million, one hundred twenty-two thousand, two hundred thirty-seven".