12001031021 has 8 divisors (see below), whose sum is σ = 13775358720. Its totient is φ = 10241677008.

The previous prime is 12001030999. The next prime is 12001031027. The reversal of 12001031021 is 12013010021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001031021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12001030993 and 12001031011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001031027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3741701 + ... + 3744906.

It is an arithmetic number, because the mean of its divisors is an integer number (1721919840).

Almost surely, 2^12001031021 is an apocalyptic number.

It is an amenable number.

12001031021 is a deficient number, since it is larger than the sum of its proper divisors (1774327699).

12001031021 is an equidigital number, since it uses as much as digits as its factorization.

12001031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486843.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 12001031021 its reverse (12013010021), we get a palindrome (24014041042).

The spelling of 12001031021 in words is "twelve billion, one million, thirty-one thousand, twenty-one".