213244237 has 2 divisors, whose sum is σ = 213244238. Its totient is φ = 213244236.

The previous prime is 213244219. The next prime is 213244313. The reversal of 213244237 is 732442312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152497801 + 60746436 = 12349^2 + 7794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213244237 is a prime.

It is a super-2 number, since 2×213244237² = 90946209227424338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213245237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106622118 + 106622119.

It is an arithmetic number, because the mean of its divisors is an integer number (106622119).

Almost surely, 2^213244237 is an apocalyptic number.

It is an amenable number.

213244237 is a deficient number, since it is larger than the sum of its proper divisors (1).

213244237 is an equidigital number, since it uses as much as digits as its factorization.

213244237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 28.

The square root of 213244237 is about 14602.8845438153. The cubic root of 213244237 is about 597.4374386392.

Adding to 213244237 its reverse (732442312), we get a palindrome (945686549).

The spelling of 213244237 in words is "two hundred thirteen million, two hundred forty-four thousand, two hundred thirty-seven".