12211222121011 has 4 divisors (see below), whose sum is σ = 12224509632400. Its totient is φ = 12197934609624.

The previous prime is 12211222120997. The next prime is 12211222121029. The reversal of 12211222121011 is 11012122211221.

It is a happy number.

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 12211222121011 - 2¹⁵ = 12211222088243 is a prime.

It is a super-2 number, since 2×12211222121011² (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 12211222121011.

It is not an unprimeable number, because it can be changed into a prime (12211222121041) 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, 6643754316 + ... + 6643756153.

It is an arithmetic number, because the mean of its divisors is an integer number (3056127408100).

Almost surely, 2^{12211222121011} is an apocalyptic number.

12211222121011 is a deficient number, since it is larger than the sum of its proper divisors (13287511389).

12211222121011 is an equidigital number, since it uses as much as digits as its factorization.

12211222121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13287511388.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12211222121011 its reverse (11012122211221), we get a palindrome (23223344332232).

The spelling of 12211222121011 in words is "twelve trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, eleven".