2121201110121 has 32 divisors (see below), whose sum is σ = 2927375962368. Its totient is φ = 1365198105600.

The previous prime is 2121201110117. The next prime is 2121201110141. The reversal of 2121201110121 is 1210111021212.

It is a happy number.

It is not a de Polignac number, because 2121201110121 - 2² = 2121201110117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121201110121.

It is not an unprimeable number, because it can be changed into a prime (2121201110101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14290341 + ... + 14438013.

It is an arithmetic number, because the mean of its divisors is an integer number (91480498824).

Almost surely, 2^{2121201110121} is an apocalyptic number.

It is an amenable number.

2121201110121 is a deficient number, since it is larger than the sum of its proper divisors (806174852247).

2121201110121 is a wasteful number, since it uses less digits than its factorization.

2121201110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148721.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2121201110121 its reverse (1210111021212), we get a palindrome (3331312131333).

It can be divided in two parts, 2121201 and 110121, that added together give a palindrome (2231322).

The spelling of 2121201110121 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred ten thousand, one hundred twenty-one".