12436346221 has 4 divisors (see below), whose sum is σ = 13392988252. Its totient is φ = 11479704192.

The previous prime is 12436346177. The next prime is 12436346227. The reversal of 12436346221 is 12264363421.

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 1435273225 + 11001072996 = 37885^2 + 104886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12436346221 is a prime.

It is a super-3 number, since 3×12436346221³ (a number of 31 digits) contains 333 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 (12436346227) 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, 478320996 + ... + 478321021.

It is an arithmetic number, because the mean of its divisors is an integer number (3348247063).

Almost surely, 2^12436346221 is an apocalyptic number.

It is an amenable number.

12436346221 is a deficient number, since it is larger than the sum of its proper divisors (956642031).

12436346221 is an equidigital number, since it uses as much as digits as its factorization.

12436346221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956642030.

The product of its digits is 41472, while the sum is 34.

The spelling of 12436346221 in words is "twelve billion, four hundred thirty-six million, three hundred forty-six thousand, two hundred twenty-one".