12212120111 has 4 divisors (see below), whose sum is σ = 12215432424. Its totient is φ = 12208807800.

The previous prime is 12212120101. The next prime is 12212120113. The reversal of 12212120111 is 11102121221.

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 12212120111 - 2¹⁴ = 12212103727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212120113) 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, 1650620 + ... + 1658001.

It is an arithmetic number, because the mean of its divisors is an integer number (3053858106).

Almost surely, 2^12212120111 is an apocalyptic number.

12212120111 is a deficient number, since it is larger than the sum of its proper divisors (3312313).

12212120111 is an equidigital number, since it uses as much as digits as its factorization.

12212120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312312.

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

Adding to 12212120111 its reverse (11102121221), we get a palindrome (23314241332).

The spelling of 12212120111 in words is "twelve billion, two hundred twelve million, one hundred twenty thousand, one hundred eleven".