12012211101221 has 4 divisors (see below), whose sum is σ = 12718811754252. Its totient is φ = 11305610448192.

The previous prime is 12012211101131. The next prime is 12012211101229. The reversal of 12012211101221 is 12210111221021.

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 10824830392321 + 1187380708900 = 3290111^2 + 1089670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012211101221 - 2³⁸ = 11737333194277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 706600653013 = 12012211101221 / (1 + 2 + 0 + 1 + 2 + 2 + 1 + 1 + 1 + 0 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012211101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012211101229) 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, 353300326490 + ... + 353300326523.

It is an arithmetic number, because the mean of its divisors is an integer number (3179702938563).

Almost surely, 2^{12012211101221} is an apocalyptic number.

It is an amenable number.

12012211101221 is a deficient number, since it is larger than the sum of its proper divisors (706600653031).

12012211101221 is an equidigital number, since it uses as much as digits as its factorization.

12012211101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706600653030.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12012211101221 its reverse (12210111221021), we get a palindrome (24222322322242).

The spelling of 12012211101221 in words is "twelve trillion, twelve billion, two hundred eleven million, one hundred one thousand, two hundred twenty-one".