12122212012221 has 16 divisors (see below), whose sum is σ = 16180986902400. Its totient is φ = 8072460446208.

The previous prime is 12122212012219. The next prime is 12122212012231. The reversal of 12122212012221 is 12221021222121.

It is not a de Polignac number, because 12122212012221 - 2¹ = 12122212012219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122212012201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10133025 + ... + 11265993.

It is an arithmetic number, because the mean of its divisors is an integer number (1011311681400).

Almost surely, 2^{12122212012221} is an apocalyptic number.

It is an amenable number.

12122212012221 is a deficient number, since it is larger than the sum of its proper divisors (4058774890179).

12122212012221 is a wasteful number, since it uses less digits than its factorization.

12122212012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136948.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12122212012221 its reverse (12221021222121), we get a palindrome (24343233234342).

The spelling of 12122212012221 in words is "twelve trillion, one hundred twenty-two billion, two hundred twelve million, twelve thousand, two hundred twenty-one".