12211210111021 has 4 divisors (see below), whose sum is σ = 12348414719100. Its totient is φ = 12074005502944.

The previous prime is 12211210110959. The next prime is 12211210111033. The reversal of 12211210111021 is 12011101211221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2251158148996 + 9960051962025 = 1500386^2 + 3155955^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211210111021 - 2³¹ = 12209062627373 is a prime.

It is a super-2 number, since 2×12211210111021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211210110986 and 12211210111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211210115021) 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, 68602303906 + ... + 68602304083.

It is an arithmetic number, because the mean of its divisors is an integer number (3087103679775).

Almost surely, 2^{12211210111021} is an apocalyptic number.

It is an amenable number.

12211210111021 is a deficient number, since it is larger than the sum of its proper divisors (137204608079).

12211210111021 is an equidigital number, since it uses as much as digits as its factorization.

12211210111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137204608078.

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

Adding to 12211210111021 its reverse (12011101211221), we get a palindrome (24222311322242).

The spelling of 12211210111021 in words is "twelve trillion, two hundred eleven billion, two hundred ten million, one hundred eleven thousand, twenty-one".