12000021020021 has 8 divisors (see below), whose sum is σ = 13049307437400. Its totient is φ = 10988890472448.

The previous prime is 12000021019957. The next prime is 12000021020047. The reversal of 12000021020021 is 12002012000021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7749063633796 + 4250957386225 = 2783714^2 + 2061785^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12000021020021 - 2⁶ = 12000021019957 is a prime.

It is a super-4 number, since 4×12000021020021⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000021019984 and 12000021020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000021020051) 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, 9538966796 + ... + 9538968053.

It is an arithmetic number, because the mean of its divisors is an integer number (1631163429675).

Almost surely, 2^{12000021020021} is an apocalyptic number.

It is an amenable number.

12000021020021 is a deficient number, since it is larger than the sum of its proper divisors (1049286417379).

12000021020021 is a wasteful number, since it uses less digits than its factorization.

12000021020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19077934903.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12000021020021 its reverse (12002012000021), we get a palindrome (24002033020042).

The spelling of 12000021020021 in words is "twelve trillion, twenty-one million, twenty thousand, twenty-one".