12211130021 has 4 divisors (see below), whose sum is σ = 12632203500. Its totient is φ = 11790056544.

The previous prime is 12211130011. The next prime is 12211130089. The reversal of 12211130021 is 12003111221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12003111221 = 439 ⋅27341939.

It can be written as a sum of positive squares in 2 ways, for example, as 5839099396 + 6372030625 = 76414^2 + 79825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211130021 is a prime.

It is a super-2 number, since 2×12211130021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12211129978 and 12211130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211130011) 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, 210536696 + ... + 210536753.

It is an arithmetic number, because the mean of its divisors is an integer number (3158050875).

Almost surely, 2^12211130021 is an apocalyptic number.

It is an amenable number.

12211130021 is a deficient number, since it is larger than the sum of its proper divisors (421073479).

12211130021 is an equidigital number, since it uses as much as digits as its factorization.

12211130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421073478.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12211130021 its reverse (12003111221), we get a palindrome (24214241242).

The spelling of 12211130021 in words is "twelve billion, two hundred eleven million, one hundred thirty thousand, twenty-one".