11212321221111 has 16 divisors (see below), whose sum is σ = 15234430057344. Its totient is φ = 7332594700704.

The previous prime is 11212321221061. The next prime is 11212321221263. The reversal of 11212321221111 is 11112212321211.

It is not a de Polignac number, because 11212321221111 - 2¹⁹ = 11212320696823 is a prime.

It is a super-2 number, since 2×11212321221111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212321228111) 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, 5076841 + ... + 6942546.

It is an arithmetic number, because the mean of its divisors is an integer number (952151878584).

Almost surely, 2^{11212321221111} is an apocalyptic number.

11212321221111 is a deficient number, since it is larger than the sum of its proper divisors (4022108836233).

11212321221111 is a wasteful number, since it uses less digits than its factorization.

11212321221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12025310.

The product of its digits is 96, while the sum is 21.

Adding to 11212321221111 its reverse (11112212321211), we get a palindrome (22324533542322).

The spelling of 11212321221111 in words is "eleven trillion, two hundred twelve billion, three hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".