11211210212111 has 16 divisors (see below), whose sum is σ = 13878172198464. Its totient is φ = 8819134032384.

The previous prime is 11211210212099. The next prime is 11211210212113. The reversal of 11211210212111 is 11121201211211.

It is not a de Polignac number, because 11211210212111 - 2¹⁰ = 11211210211087 is a prime.

It is a super-2 number, since 2×11211210212111² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11211210212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211210212113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356053946 + ... + 356085431.

It is an arithmetic number, because the mean of its divisors is an integer number (867385762404).

Almost surely, 2^{11211210212111} is an apocalyptic number.

11211210212111 is a deficient number, since it is larger than the sum of its proper divisors (2666961986353).

11211210212111 is a wasteful number, since it uses less digits than its factorization.

11211210212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712139570.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11211210212111 its reverse (11121201211211), we get a palindrome (22332411423322).

The spelling of 11211210212111 in words is "eleven trillion, two hundred eleven billion, two hundred ten million, two hundred twelve thousand, one hundred eleven".