12212212222121 has 4 divisors (see below), whose sum is σ = 12214377897600. Its totient is φ = 12210046546644.

The previous prime is 12212212222117. The next prime is 12212212222139. The reversal of 12212212222121 is 12122221221221.

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 a cyclic number.

It is not a de Polignac number, because 12212212222121 - 2² = 12212212222117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212212222141) 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, 1082829281 + ... + 1082840558.

It is an arithmetic number, because the mean of its divisors is an integer number (3053594474400).

Almost surely, 2^{12212212222121} is an apocalyptic number.

It is an amenable number.

12212212222121 is a deficient number, since it is larger than the sum of its proper divisors (2165675479).

12212212222121 is an equidigital number, since it uses as much as digits as its factorization.

12212212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165675478.

The product of its digits is 512, while the sum is 23.

Adding to 12212212222121 its reverse (12122221221221), we get a palindrome (24334433443342).

The spelling of 12212212222121 in words is "twelve trillion, two hundred twelve billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".