213231 has 16 divisors (see below), whose sum is σ = 311904. Its totient is φ = 129024.

The previous prime is 213229. The next prime is 213247. The reversal of 213231 is 132312.

It is a happy number.

It is not a de Polignac number, because 213231 - 2¹ = 213229 is a prime.

It is a super-2 number, since 2×213231² = 90934918722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213281) 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, 1831 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (19494).

2²¹³²³¹ is an apocalyptic number.

213231 is a deficient number, since it is larger than the sum of its proper divisors (98673).

213231 is a wasteful number, since it uses less digits than its factorization.

213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170.

The product of its digits is 36, while the sum is 12.

The square root of 213231 is about 461.7694229808. The cubic root of 213231 is about 59.7425076534.

Adding to 213231 its reverse (132312), we get a palindrome (345543).

It can be divided in two parts, 213 and 231, that added together give a palindrome (444).

The spelling of 213231 in words is "two hundred thirteen thousand, two hundred thirty-one".