12120012021 has 16 divisors (see below), whose sum is σ = 18003202560. Its totient is φ = 7201279680.

The previous prime is 12120011993. The next prime is 12120012043. The reversal of 12120012021 is 12021002121.

It is not a de Polignac number, because 12120012021 - 2⁹ = 12120011509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12120011988 and 12120012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120012071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5356965 + ... + 5359226.

It is an arithmetic number, because the mean of its divisors is an integer number (1125200160).

Almost surely, 2^12120012021 is an apocalyptic number.

It is an amenable number.

12120012021 is a deficient number, since it is larger than the sum of its proper divisors (5883190539).

12120012021 is a wasteful number, since it uses less digits than its factorization.

12120012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10716236.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12120012021 its reverse (12021002121), we get a palindrome (24141014142).

The spelling of 12120012021 in words is "twelve billion, one hundred twenty million, twelve thousand, twenty-one".