12211234421 has 4 divisors (see below), whose sum is σ = 12632311500. Its totient is φ = 11790157344.

The previous prime is 12211234417. The next prime is 12211234433. The reversal of 12211234421 is 12443211221.

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 3877552900 + 8333681521 = 62270^2 + 91289^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211234421 - 2² = 12211234417 is a prime.

It is a super-2 number, since 2×12211234421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211234921) 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, 210538496 + ... + 210538553.

It is an arithmetic number, because the mean of its divisors is an integer number (3158077875).

Almost surely, 2^12211234421 is an apocalyptic number.

It is an amenable number.

12211234421 is a deficient number, since it is larger than the sum of its proper divisors (421077079).

12211234421 is an equidigital number, since it uses as much as digits as its factorization.

12211234421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421077078.

The product of its digits is 768, while the sum is 23.

Adding to 12211234421 its reverse (12443211221), we get a palindrome (24654445642).

The spelling of 12211234421 in words is "twelve billion, two hundred eleven million, two hundred thirty-four thousand, four hundred twenty-one".