2111212121211 has 48 divisors (see below), whose sum is σ = 3228577986816. Its totient is φ = 1326705386688.

The previous prime is 2111212121149. The next prime is 2111212121237. The reversal of 2111212121211 is 1121212121112.

It is a happy number.

2111212121211 is a `hidden beast` number, since 211 + 121 + 2 + 121 + 211 = 666.

It is not a de Polignac number, because 2111212121211 - 2⁶ = 2111212121147 is a prime.

It is a super-2 number, since 2×2111212121211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2111212121261) 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 47 ways as a sum of consecutive naturals, for example, 6666096 + ... + 6975618.

It is an arithmetic number, because the mean of its divisors is an integer number (67262041392).

Almost surely, 2^{2111212121211} is an apocalyptic number.

2111212121211 is a deficient number, since it is larger than the sum of its proper divisors (1117365865605).

2111212121211 is a wasteful number, since it uses less digits than its factorization.

2111212121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310032 (or 310029 counting only the distinct ones).

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

Adding to 2111212121211 its reverse (1121212121112), we get a palindrome (3232424242323).

Subtracting from 2111212121211 its reverse (1121212121112), we obtain a palindrome (990000000099).

It can be divided in two parts, 211121 and 2121211, that added together give a palindrome (2332332).

The spelling of 2111212121211 in words is "two trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".