213231243 has 16 divisors (see below), whose sum is σ = 304922880. Its totient is φ = 132129504.

The previous prime is 213231197. The next prime is 213231353. The reversal of 213231243 is 342132312.

It is not a de Polignac number, because 213231243 - 2⁸ = 213230987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213231443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32271 + ... + 38312.

It is an arithmetic number, because the mean of its divisors is an integer number (19057680).

Almost surely, 2^213231243 is an apocalyptic number.

213231243 is a deficient number, since it is larger than the sum of its proper divisors (91691637).

213231243 is a wasteful number, since it uses less digits than its factorization.

213231243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70658.

The product of its digits is 864, while the sum is 21.

The square root of 213231243 is about 14602.4396249394. The cubic root of 213231243 is about 597.4253034777.

Adding to 213231243 its reverse (342132312), we get a palindrome (555363555).

The spelling of 213231243 in words is "two hundred thirteen million, two hundred thirty-one thousand, two hundred forty-three".