12020111021 has 8 divisors (see below), whose sum is σ = 12395046144. Its totient is φ = 11650142160.

The previous prime is 12020111017. The next prime is 12020111039. The reversal of 12020111021 is 12011102021.

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 12020111021 - 2² = 12020111017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020110993 and 12020111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020111321) 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, 1236650 + ... + 1246331.

It is an arithmetic number, because the mean of its divisors is an integer number (1549380768).

Almost surely, 2^12020111021 is an apocalyptic number.

It is an amenable number.

12020111021 is a deficient number, since it is larger than the sum of its proper divisors (374935123).

12020111021 is a wasteful number, since it uses less digits than its factorization.

12020111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483131.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12020111021 its reverse (12011102021), we get a palindrome (24031213042).

The spelling of 12020111021 in words is "twelve billion, twenty million, one hundred eleven thousand, twenty-one".