2121221122111 has 16 divisors (see below), whose sum is σ = 2610786439744. Its totient is φ = 1678294888704.

The previous prime is 2121221122109. The next prime is 2121221122117. The reversal of 2121221122111 is 1112211221212.

It is a happy number.

It is not a de Polignac number, because 2121221122111 - 2¹ = 2121221122109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221122117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4906531 + ... + 5321323.

It is an arithmetic number, because the mean of its divisors is an integer number (163174152484).

Almost surely, 2^{2121221122111} is an apocalyptic number.

2121221122111 is a deficient number, since it is larger than the sum of its proper divisors (489565317633).

2121221122111 is a wasteful number, since it uses less digits than its factorization.

2121221122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471010.

The product of its digits is 64, while the sum is 19.

Adding to 2121221122111 its reverse (1112211221212), we get a palindrome (3233432343323).

The spelling of 2121221122111 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".