121212201121 has 4 divisors (see below), whose sum is σ = 132231492144. Its totient is φ = 110192910100.

The previous prime is 121212201119. The next prime is 121212201167. The reversal of 121212201121 is 121102212121.

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 121212201121 - 2¹ = 121212201119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212201095 and 121212201104.

It is not an unprimeable number, because it can be changed into a prime (121212201101) 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, 5509645495 + ... + 5509645516.

It is an arithmetic number, because the mean of its divisors is an integer number (33057873036).

Almost surely, 2^121212201121 is an apocalyptic number.

121212201121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121212201121 is a deficient number, since it is larger than the sum of its proper divisors (11019291023).

121212201121 is a wasteful number, since it uses less digits than its factorization.

121212201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11019291022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121212201121 its reverse (121102212121), we get a palindrome (242314413242).

The spelling of 121212201121 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred one thousand, one hundred twenty-one".