121211122121 has 4 divisors (see below), whose sum is σ = 121271760000. Its totient is φ = 121150484244.

The previous prime is 121211122111. The next prime is 121211122129. The reversal of 121211122121 is 121221112121.

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 121211122121 - 2⁶ = 121211122057 is a prime.

It is a super-2 number, since 2×121211122121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121211122121.

It is not an unprimeable number, because it can be changed into a prime (121211122129) 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, 30315941 + ... + 30319938.

It is an arithmetic number, because the mean of its divisors is an integer number (30317940000).

Almost surely, 2^121211122121 is an apocalyptic number.

It is an amenable number.

121211122121 is a deficient number, since it is larger than the sum of its proper divisors (60637879).

121211122121 is an equidigital number, since it uses as much as digits as its factorization.

121211122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60637878.

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

Adding to 121211122121 its reverse (121221112121), we get a palindrome (242432234242).

The spelling of 121211122121 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".