20121220001121 has 4 divisors (see below), whose sum is σ = 26828293334832. Its totient is φ = 13414146667412.

The previous prime is 20121220001093. The next prime is 20121220001149. The reversal of 20121220001121 is 12110002212102.

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 an interprime number because it is at equal distance from previous prime (20121220001093) and next prime (20121220001149).

It is a cyclic number.

It is not a de Polignac number, because 20121220001121 - 2²⁹ = 20120683130209 is a prime.

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 20121220001121.

It is not an unprimeable number, because it can be changed into a prime (20121220001161) 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, 3353536666851 + ... + 3353536666856.

It is an arithmetic number, because the mean of its divisors is an integer number (6707073333708).

Almost surely, 2^{20121220001121} is an apocalyptic number.

It is an amenable number.

20121220001121 is a deficient number, since it is larger than the sum of its proper divisors (6707073333711).

20121220001121 is an equidigital number, since it uses as much as digits as its factorization.

20121220001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707073333710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121220001121 its reverse (12110002212102), we get a palindrome (32231222213223).

The spelling of 20121220001121 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, one thousand, one hundred twenty-one".