201211231 has 24 divisors (see below), whose sum is σ = 226890720. Its totient is φ = 178214400.

The previous prime is 201211229. The next prime is 201211247. The reversal of 201211231 is 132112102.

It is not a de Polignac number, because 201211231 - 2¹ = 201211229 is a prime.

It is a super-2 number, since 2×201211231² = 80971918961070722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491755 + ... + 492163.

It is an arithmetic number, because the mean of its divisors is an integer number (9453780).

Almost surely, 2^201211231 is an apocalyptic number.

201211231 is a deficient number, since it is larger than the sum of its proper divisors (25679489).

201211231 is a wasteful number, since it uses less digits than its factorization.

201211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 201211231 is about 14184.8944655926. The cubic root of 201211231 is about 585.9817260665.

Adding to 201211231 its reverse (132112102), we get a palindrome (333323333).

The spelling of 201211231 in words is "two hundred one million, two hundred eleven thousand, two hundred thirty-one".