12133131021 has 20 divisors (see below), whose sum is σ = 19772511264. Its totient is φ = 7353412200.

The previous prime is 12133130987. The next prime is 12133131029. The reversal of 12133131021 is 12013133121.

12133131021 is a `hidden beast` number, since 1 + 2 + 1 + 331 + 310 + 21 = 666.

It is not a de Polignac number, because 12133131021 - 2⁹ = 12133130509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12133130985 and 12133131003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12133131029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6807825 + ... + 6809606.

Almost surely, 2^12133131021 is an apocalyptic number.

12133131021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12133131021 is a deficient number, since it is larger than the sum of its proper divisors (7639380243).

12133131021 is a wasteful number, since it uses less digits than its factorization.

12133131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13617454 (or 13617445 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 12133131021 its reverse (12013133121), we get a palindrome (24146264142).

The spelling of 12133131021 in words is "twelve billion, one hundred thirty-three million, one hundred thirty-one thousand, twenty-one".