213123241 has 2 divisors, whose sum is σ = 213123242. Its totient is φ = 213123240.

The previous prime is 213123223. The next prime is 213123283. The reversal of 213123241 is 142321312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178783641 + 34339600 = 13371^2 + 5860^2 .

It is a cyclic number.

It is not a de Polignac number, because 213123241 - 2⁹ = 213122729 is a prime.

It is not a weakly prime, because it can be changed into another prime (213123041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561620 + 106561621.

It is an arithmetic number, because the mean of its divisors is an integer number (106561621).

Almost surely, 2^213123241 is an apocalyptic number.

It is an amenable number.

213123241 is a deficient number, since it is larger than the sum of its proper divisors (1).

213123241 is an equidigital number, since it uses as much as digits as its factorization.

213123241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 213123241 is about 14598.7410758599. The cubic root of 213123241 is about 597.3244207873.

Adding to 213123241 its reverse (142321312), we get a palindrome (355444553).

The spelling of 213123241 in words is "two hundred thirteen million, one hundred twenty-three thousand, two hundred forty-one".