12000001021 has 4 divisors (see below), whose sum is σ = 12705883452. Its totient is φ = 11294118592.

The previous prime is 12000000983. The next prime is 12000001043. The reversal of 12000001021 is 12010000021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11175449796 + 824551225 = 105714^2 + 28715^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000001021 - 2¹¹ = 11999998973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000000995 and 12000001013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000001051) 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, 352941190 + ... + 352941223.

It is an arithmetic number, because the mean of its divisors is an integer number (3176470863).

Almost surely, 2^12000001021 is an apocalyptic number.

It is an amenable number.

12000001021 is a deficient number, since it is larger than the sum of its proper divisors (705882431).

12000001021 is an equidigital number, since it uses as much as digits as its factorization.

12000001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705882430.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 12000001021 its reverse (12010000021), we get a palindrome (24010001042).

It can be divided in two parts, 1200000 and 1021, that added together give a palindrome (1201021).

The spelling of 12000001021 in words is "twelve billion, one thousand, twenty-one".