121200212202121 has 8 divisors (see below), whose sum is σ = 130842433340360. Its totient is φ = 111603580762752.

The previous prime is 121200212202109. The next prime is 121200212202169. The reversal of 121200212202121 is 121202212002121.

It can be written as a sum of positive squares in 4 ways, for example, as 22192239626496 + 99007972575625 = 4710864^2 + 9950275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121200212202121 - 2⁹ = 121200212201609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200212202521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11397419190 + ... + 11397429823.

It is an arithmetic number, because the mean of its divisors is an integer number (16355304167545).

Almost surely, 2^{121200212202121} is an apocalyptic number.

It is an amenable number.

121200212202121 is a deficient number, since it is larger than the sum of its proper divisors (9642221138239).

121200212202121 is a wasteful number, since it uses less digits than its factorization.

121200212202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22794849435.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121200212202121 its reverse (121202212002121), we get a palindrome (242402424204242).

The spelling of 121200212202121 in words is "one hundred twenty-one trillion, two hundred billion, two hundred twelve million, two hundred two thousand, one hundred twenty-one".