213144331 has 2 divisors, whose sum is σ = 213144332. Its totient is φ = 213144330.

The previous prime is 213144319. The next prime is 213144361. The reversal of 213144331 is 133441312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213144331 - 2⁷ = 213144203 is a prime.

It is a super-2 number, since 2×213144331² = 90861011674875122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213144311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106572165 + 106572166.

It is an arithmetic number, because the mean of its divisors is an integer number (106572166).

Almost surely, 2^213144331 is an apocalyptic number.

213144331 is a deficient number, since it is larger than the sum of its proper divisors (1).

213144331 is an equidigital number, since it uses as much as digits as its factorization.

213144331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 213144331 is about 14599.4633805493. The cubic root of 213144331 is about 597.3441232475.

Adding to 213144331 its reverse (133441312), we get a palindrome (346585643).

The spelling of 213144331 in words is "two hundred thirteen million, one hundred forty-four thousand, three hundred thirty-one".