12020120021 has 16 divisors (see below), whose sum is σ = 14797843200. Its totient is φ = 9507950208.

The previous prime is 12020119997. The next prime is 12020120023. The reversal of 12020120021 is 12002102021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12020120021 - 2¹⁴ = 12020103637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12020119984 and 12020120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386240 + ... + 416198.

It is an arithmetic number, because the mean of its divisors is an integer number (924865200).

Almost surely, 2^12020120021 is an apocalyptic number.

It is an amenable number.

12020120021 is a deficient number, since it is larger than the sum of its proper divisors (2777723179).

12020120021 is a wasteful number, since it uses less digits than its factorization.

12020120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34388.

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

Adding to 12020120021 its reverse (12002102021), we get a palindrome (24022222042).

The spelling of 12020120021 in words is "twelve billion, twenty million, one hundred twenty thousand, twenty-one".