201231211331 has 4 divisors (see below), whose sum is σ = 203223599664. Its totient is φ = 199238823000.

The previous prime is 201231211303. The next prime is 201231211403. The reversal of 201231211331 is 133112132102.

It is a happy number.

201231211331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201231211331 - 2³⁰ = 200157469507 is a prime.

It is a super-2 number, since 2×201231211331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201231211031) 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, 996194015 + ... + 996194216.

It is an arithmetic number, because the mean of its divisors is an integer number (50805899916).

Almost surely, 2^201231211331 is an apocalyptic number.

201231211331 is a deficient number, since it is larger than the sum of its proper divisors (1992388333).

201231211331 is a wasteful number, since it uses less digits than its factorization.

201231211331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992388332.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 201231211331 its reverse (133112132102), we get a palindrome (334343343433).

The spelling of 201231211331 in words is "two hundred one billion, two hundred thirty-one million, two hundred eleven thousand, three hundred thirty-one".