12001011021 has 12 divisors (see below), whose sum is σ = 18247151520. Its totient is φ = 7579585800.

The previous prime is 12001011019. The next prime is 12001011023. The reversal of 12001011021 is 12011010021.

It is a happy number.

12001011021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12001011019) and next prime (12001011023).

It is not a de Polignac number, because 12001011021 - 2¹ = 12001011019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12001010994 and 12001011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35090505 + ... + 35090846.

It is an arithmetic number, because the mean of its divisors is an integer number (1520595960).

Almost surely, 2^12001011021 is an apocalyptic number.

It is an amenable number.

12001011021 is a deficient number, since it is larger than the sum of its proper divisors (6246140499).

12001011021 is a wasteful number, since it uses less digits than its factorization.

12001011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70181376 (or 70181373 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12001011021 its reverse (12011010021), we get a palindrome (24012021042).

The spelling of 12001011021 in words is "twelve billion, one million, eleven thousand, twenty-one".