121112202121 has 4 divisors (see below), whose sum is σ = 121455296532. Its totient is φ = 120769107712.

The previous prime is 121112202097. The next prime is 121112202131. The reversal of 121112202121 is 121202211121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17672777721 + 103439424400 = 132939^2 + 321620^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112202121 - 2⁷ = 121112201993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112202095 and 121112202104.

It is not an unprimeable number, because it can be changed into a prime (121112202131) 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, 171546676 + ... + 171547381.

It is an arithmetic number, because the mean of its divisors is an integer number (30363824133).

Almost surely, 2^121112202121 is an apocalyptic number.

It is an amenable number.

121112202121 is a deficient number, since it is larger than the sum of its proper divisors (343094411).

121112202121 is an equidigital number, since it uses as much as digits as its factorization.

121112202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343094410.

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

Adding to 121112202121 its reverse (121202211121), we get a palindrome (242314413242).

The spelling of 121112202121 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred two thousand, one hundred twenty-one".