12121102101221 has 4 divisors (see below), whose sum is σ = 12122346194112. Its totient is φ = 12119858008332.

The previous prime is 12121102101191. The next prime is 12121102101247. The reversal of 12121102101221 is 12210120112121.

12121102101221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12121102101221 - 2²² = 12121097906917 is a prime.

It is a super-2 number, since 2×12121102101221² (a number of 27 digits) contains 22 as substring.

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 12121102101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121102101271) 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, 622031831 + ... + 622051316.

It is an arithmetic number, because the mean of its divisors is an integer number (3030586548528).

Almost surely, 2^{12121102101221} is an apocalyptic number.

It is an amenable number.

12121102101221 is a deficient number, since it is larger than the sum of its proper divisors (1244092891).

12121102101221 is an equidigital number, since it uses as much as digits as its factorization.

12121102101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244092890.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12121102101221 its reverse (12210120112121), we get a palindrome (24331222213342).

The spelling of 12121102101221 in words is "twelve trillion, one hundred twenty-one billion, one hundred two million, one hundred one thousand, two hundred twenty-one".