12320012221 has 4 divisors (see below), whose sum is σ = 13440013344. Its totient is φ = 11200011100.

The previous prime is 12320012209. The next prime is 12320012267. The reversal of 12320012221 is 12221002321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12320012221 - 2⁵ = 12320012189 is a prime.

It is a super-2 number, since 2×12320012221² (a number of 21 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 = 12320012195 and 12320012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320012521) 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, 560000545 + ... + 560000566.

It is an arithmetic number, because the mean of its divisors is an integer number (3360003336).

Almost surely, 2^12320012221 is an apocalyptic number.

12320012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12320012221 is a deficient number, since it is larger than the sum of its proper divisors (1120001123).

12320012221 is a wasteful number, since it uses less digits than its factorization.

12320012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120001122.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12320012221 its reverse (12221002321), we get a palindrome (24541014542).

The spelling of 12320012221 in words is "twelve billion, three hundred twenty million, twelve thousand, two hundred twenty-one".