2121220111121 has 8 divisors (see below), whose sum is σ = 2188589978400. Its totient is φ = 2054594662560.

The previous prime is 2121220111099. The next prime is 2121220111123. The reversal of 2121220111121 is 1211110221212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121220111121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121220111121.

It is not an unprimeable number, because it can be changed into a prime (2121220111123) 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, 186098891 + ... + 186110288.

It is an arithmetic number, because the mean of its divisors is an integer number (273573747300).

Almost surely, 2^{2121220111121} is an apocalyptic number.

It is an amenable number.

2121220111121 is a deficient number, since it is larger than the sum of its proper divisors (67369867279).

2121220111121 is a wasteful number, since it uses less digits than its factorization.

2121220111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372209359.

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

Adding to 2121220111121 its reverse (1211110221212), we get a palindrome (3332330332333).

The spelling of 2121220111121 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-one".