201231213 has 4 divisors (see below), whose sum is σ = 268308288. Its totient is φ = 134154140.

The previous prime is 201231211. The next prime is 201231221. The reversal of 201231213 is 312132102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201231213 - 2¹ = 201231211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201231192 and 201231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33538533 + ... + 33538538.

It is an arithmetic number, because the mean of its divisors is an integer number (67077072).

Almost surely, 2^201231213 is an apocalyptic number.

It is an amenable number.

201231213 is a deficient number, since it is larger than the sum of its proper divisors (67077075).

201231213 is an equidigital number, since it uses as much as digits as its factorization.

201231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67077074.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 201231213 is about 14185.5987889126. The cubic root of 201231213 is about 586.0011230938.

Adding to 201231213 its reverse (312132102), we get a palindrome (513363315).

The spelling of 201231213 in words is "two hundred one million, two hundred thirty-one thousand, two hundred thirteen".