11211121212111 has 12 divisors (see below), whose sum is σ = 16631513149992. Its totient is φ = 7272078623856.

The previous prime is 11211121212101. The next prime is 11211121212121. The reversal of 11211121212111 is 11121212111211.

11211121212111 is a `hidden beast` number, since 11 + 211 + 121 + 212 + 111 = 666.

It is an interprime number because it is at equal distance from previous prime (11211121212101) and next prime (11211121212121).

It is not a de Polignac number, because 11211121212111 - 2¹⁴ = 11211121195727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211121212101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16833515001 + ... + 16833515666.

It is an arithmetic number, because the mean of its divisors is an integer number (1385959429166).

Almost surely, 2^{11211121212111} is an apocalyptic number.

11211121212111 is a deficient number, since it is larger than the sum of its proper divisors (5420391937881).

11211121212111 is a wasteful number, since it uses less digits than its factorization.

11211121212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33667030710 (or 33667030707 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 11211121212111 its reverse (11121212111211), we get a palindrome (22332333323322).

The spelling of 11211121212111 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".