12120111010021 has 4 divisors (see below), whose sum is σ = 13851555440032. Its totient is φ = 10388666580012.

The previous prime is 12120111009989. The next prime is 12120111010031. The reversal of 12120111010021 is 12001011102121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12120111010021 - 2⁵ = 12120111009989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120111009983 and 12120111010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120111010031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865722214995 + ... + 865722215008.

It is an arithmetic number, because the mean of its divisors is an integer number (3462888860008).

Almost surely, 2^{12120111010021} is an apocalyptic number.

It is an amenable number.

12120111010021 is a deficient number, since it is larger than the sum of its proper divisors (1731444430011).

12120111010021 is an equidigital number, since it uses as much as digits as its factorization.

12120111010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731444430010.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12120111010021 its reverse (12001011102121), we get a palindrome (24121122112142).

The spelling of 12120111010021 in words is "twelve trillion, one hundred twenty billion, one hundred eleven million, ten thousand, twenty-one".