12020000021021 has 8 divisors (see below), whose sum is σ = 12356815424184. Its totient is φ = 11683813593600.

The previous prime is 12020000020993. The next prime is 12020000021023. The reversal of 12020000021021 is 12012000002021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7143031296025 + 4876968724996 = 2672645^2 + 2208386^2 .

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 12020000021021 - 2¹⁰ = 12020000019997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020000020993 and 12020000021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020000021023) 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, 157205180 + ... + 157281621.

It is an arithmetic number, because the mean of its divisors is an integer number (1544601928023).

Almost surely, 2^{12020000021021} is an apocalyptic number.

It is an amenable number.

12020000021021 is a deficient number, since it is larger than the sum of its proper divisors (336815403163).

12020000021021 is a wasteful number, since it uses less digits than its factorization.

12020000021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314487871.

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

Adding to 12020000021021 its reverse (12012000002021), we get a palindrome (24032000023042).

The spelling of 12020000021021 in words is "twelve trillion, twenty billion, twenty-one thousand, twenty-one".