12221012122121 has 16 divisors (see below), whose sum is σ = 13464675638208. Its totient is φ = 10999469832000.

The previous prime is 12221012122117. The next prime is 12221012122133. The reversal of 12221012122121 is 12122121012221.

It is a cyclic number.

It is not a de Polignac number, because 12221012122121 - 2² = 12221012122117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12221012122093 and 12221012122102.

It is not an unprimeable number, because it can be changed into a prime (12221012122171) 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, 23245466 + ... + 23765388.

It is an arithmetic number, because the mean of its divisors is an integer number (841542227388).

Almost surely, 2^{12221012122121} is an apocalyptic number.

12221012122121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221012122121 is a deficient number, since it is larger than the sum of its proper divisors (1243663516087).

12221012122121 is a wasteful number, since it uses less digits than its factorization.

12221012122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541192.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12221012122121 its reverse (12122121012221), we get a palindrome (24343133134342).

The spelling of 12221012122121 in words is "twelve trillion, two hundred twenty-one billion, twelve million, one hundred twenty-two thousand, one hundred twenty-one".