12220312121 has 4 divisors (see below), whose sum is σ = 12338956032. Its totient is φ = 12101668212.

The previous prime is 12220312021. The next prime is 12220312123. The reversal of 12220312121 is 12121302221.

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 12220312121 - 2¹⁰ = 12220311097 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 12220312121.

It is not an unprimeable number, because it can be changed into a prime (12220312123) 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, 59321801 + ... + 59322006.

It is an arithmetic number, because the mean of its divisors is an integer number (3084739008).

Almost surely, 2^12220312121 is an apocalyptic number.

It is an amenable number.

12220312121 is a deficient number, since it is larger than the sum of its proper divisors (118643911).

12220312121 is a wasteful number, since it uses less digits than its factorization.

12220312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118643910.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12220312121 its reverse (12121302221), we get a palindrome (24341614342).

The spelling of 12220312121 in words is "twelve billion, two hundred twenty million, three hundred twelve thousand, one hundred twenty-one".