12012211010021 has 4 divisors (see below), whose sum is σ = 12088721908332. Its totient is φ = 11935700111712.

The previous prime is 12012211009963. The next prime is 12012211010027. The reversal of 12012211010021 is 12001011221021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1847343088900 + 10164867921121 = 1359170^2 + 3188239^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012211010021 - 2²² = 12012206815717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012211009978 and 12012211010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012211010027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38255448920 + ... + 38255449233.

It is an arithmetic number, because the mean of its divisors is an integer number (3022180477083).

Almost surely, 2^{12012211010021} is an apocalyptic number.

It is an amenable number.

12012211010021 is a deficient number, since it is larger than the sum of its proper divisors (76510898311).

12012211010021 is an equidigital number, since it uses as much as digits as its factorization.

12012211010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76510898310.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12012211010021 its reverse (12001011221021), we get a palindrome (24013222231042).

The spelling of 12012211010021 in words is "twelve trillion, twelve billion, two hundred eleven million, ten thousand, twenty-one".