213123331 has 2 divisors, whose sum is σ = 213123332. Its totient is φ = 213123330.

The previous prime is 213123319. The next prime is 213123401. The reversal of 213123331 is 133321312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213123331 - 2¹¹ = 213121283 is a prime.

It is a super-2 number, since 2×213123331² = 90843108433071122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213123299 and 213123308.

It is not a weakly prime, because it can be changed into another prime (213123301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561665 + 106561666.

It is an arithmetic number, because the mean of its divisors is an integer number (106561666).

Almost surely, 2^213123331 is an apocalyptic number.

213123331 is a deficient number, since it is larger than the sum of its proper divisors (1).

213123331 is an equidigital number, since it uses as much as digits as its factorization.

213123331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 19.

The square root of 213123331 is about 14598.7441583172. The cubic root of 213123331 is about 597.3245048689.

Adding to 213123331 its reverse (133321312), we get a palindrome (346444643).

The spelling of 213123331 in words is "two hundred thirteen million, one hundred twenty-three thousand, three hundred thirty-one".