12031031021 has 16 divisors (see below), whose sum is σ = 12982670400. Its totient is φ = 11111644800.

The previous prime is 12031030997. The next prime is 12031031027. The reversal of 12031031021 is 12013013021.

It is a cyclic number.

It is not a de Polignac number, because 12031031021 - 2¹⁴ = 12031014637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12031030987 and 12031031005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12031031027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1225151 + ... + 1234931.

It is an arithmetic number, because the mean of its divisors is an integer number (811416900).

Almost surely, 2^12031031021 is an apocalyptic number.

It is an amenable number.

12031031021 is a deficient number, since it is larger than the sum of its proper divisors (951639379).

12031031021 is a wasteful number, since it uses less digits than its factorization.

12031031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11420.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 12031031021 its reverse (12013013021), we get a palindrome (24044044042).

The spelling of 12031031021 in words is "twelve billion, thirty-one million, thirty-one thousand, twenty-one".