11101122121211 has 4 divisors (see below), whose sum is σ = 11106708998952. Its totient is φ = 11095535243472.

The previous prime is 11101122121189. The next prime is 11101122121267. The reversal of 11101122121211 is 11212122110111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11101122121211 - 2²⁶ = 11101055012347 is a prime.

It is a super-2 number, since 2×11101122121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11101122121211.

It is not an unprimeable number, because it can be changed into a prime (11101122121291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2793435890 + ... + 2793439863.

It is an arithmetic number, because the mean of its divisors is an integer number (2776677249738).

Almost surely, 2^{11101122121211} is an apocalyptic number.

11101122121211 is a deficient number, since it is larger than the sum of its proper divisors (5586877741).

11101122121211 is an equidigital number, since it uses as much as digits as its factorization.

11101122121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586877740.

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

Adding to 11101122121211 its reverse (11212122110111), we get a palindrome (22313244231322).

It can be divided in two parts, 1110112 and 2121211, that added together give a palindrome (3231323).

The spelling of 11101122121211 in words is "eleven trillion, one hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".