2121123311211 has 16 divisors (see below), whose sum is σ = 2998798871328. Its totient is φ = 1329002304000.

The previous prime is 2121123311137. The next prime is 2121123311213. The reversal of 2121123311211 is 1121133211212.

It is not a de Polignac number, because 2121123311211 - 2¹¹ = 2121123309163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121123311213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29629480 + ... + 29700981.

It is an arithmetic number, because the mean of its divisors is an integer number (187424929458).

Almost surely, 2^{2121123311211} is an apocalyptic number.

2121123311211 is a deficient number, since it is larger than the sum of its proper divisors (877675560117).

2121123311211 is a wasteful number, since it uses less digits than its factorization.

2121123311211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59331182.

The product of its digits is 144, while the sum is 21.

Adding to 2121123311211 its reverse (1121133211212), we get a palindrome (3242256522423).

Subtracting from 2121123311211 its reverse (1121133211212), we obtain a palindrome (999990099999).

The spelling of 2121123311211 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, three hundred eleven thousand, two hundred eleven".