2121121122111 has 48 divisors (see below), whose sum is σ = 3210247622400. Its totient is φ = 1347833862144.

The previous prime is 2121121122083. The next prime is 2121121122119. The reversal of 2121121122111 is 1112211211212.

It is a happy number.

2121121122111 is a `hidden beast` number, since 21 + 211 + 211 + 221 + 1 + 1 = 666.

It is not a de Polignac number, because 2121121122111 - 2⁶ = 2121121122047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121122119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9945330 + ... + 10156368.

It is an arithmetic number, because the mean of its divisors is an integer number (66880158800).

Almost surely, 2^{2121121122111} is an apocalyptic number.

2121121122111 is a deficient number, since it is larger than the sum of its proper divisors (1089126500289).

2121121122111 is a wasteful number, since it uses less digits than its factorization.

2121121122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211568 (or 211565 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 2121121122111 its reverse (1112211211212), we get a palindrome (3233332333323).

The spelling of 2121121122111 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".