12221221122121 has 16 divisors (see below), whose sum is σ = 13448826978048. Its totient is φ = 11013233259600.

The previous prime is 12221221122119. The next prime is 12221221122179. The reversal of 12221221122121 is 12122112212221.

It is not a de Polignac number, because 12221221122121 - 2¹ = 12221221122119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221221122092 and 12221221122101.

It is not an unprimeable number, because it can be changed into a prime (12221221222121) 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, 3368355 + ... + 5982328.

It is an arithmetic number, because the mean of its divisors is an integer number (840551686128).

Almost surely, 2^{12221221122121} is an apocalyptic number.

12221221122121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221221122121 is a deficient number, since it is larger than the sum of its proper divisors (1227605855927).

12221221122121 is a wasteful number, since it uses less digits than its factorization.

12221221122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9351732.

The product of its digits is 256, while the sum is 22.

Adding to 12221221122121 its reverse (12122112212221), we get a palindrome (24343333334342).

The spelling of 12221221122121 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".