12210121220111 has 4 divisors (see below), whose sum is σ = 12740996055792. Its totient is φ = 11679246384432.

The previous prime is 12210121220041. The next prime is 12210121220131. The reversal of 12210121220111 is 11102212101221.

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

It is a cyclic number.

It is not a de Polignac number, because 12210121220111 - 2³⁴ = 12192941350927 is a prime.

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 12210121220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210121220131) 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, 265437417806 + ... + 265437417851.

It is an arithmetic number, because the mean of its divisors is an integer number (3185249013948).

Almost surely, 2^{12210121220111} is an apocalyptic number.

12210121220111 is a deficient number, since it is larger than the sum of its proper divisors (530874835681).

12210121220111 is an equidigital number, since it uses as much as digits as its factorization.

12210121220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530874835680.

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

Adding to 12210121220111 its reverse (11102212101221), we get a palindrome (23312333321332).

The spelling of 12210121220111 in words is "twelve trillion, two hundred ten billion, one hundred twenty-one million, two hundred twenty thousand, one hundred eleven".