12201131231 has 4 divisors (see below), whose sum is σ = 12223036872. Its totient is φ = 12179225592.

The previous prime is 12201131213. The next prime is 12201131273. The reversal of 12201131231 is 13213110221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13213110221 = 41 ⋅322270981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201131231 is a prime.

It is a super-2 number, since 2×12201131231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201131281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10951985 + ... + 10953098.

It is an arithmetic number, because the mean of its divisors is an integer number (3055759218).

Almost surely, 2^12201131231 is an apocalyptic number.

12201131231 is a deficient number, since it is larger than the sum of its proper divisors (21905641).

12201131231 is an equidigital number, since it uses as much as digits as its factorization.

12201131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21905640.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12201131231 its reverse (13213110221), we get a palindrome (25414241452).

The spelling of 12201131231 in words is "twelve billion, two hundred one million, one hundred thirty-one thousand, two hundred thirty-one".