12220401221 has 8 divisors (see below), whose sum is σ = 14416694784. Its totient is φ = 10136738160.

The previous prime is 12220401197. The next prime is 12220401289. The reversal of 12220401221 is 12210402221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12220401221 - 2¹⁸ = 12220139077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12220401221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220461221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28157390 + ... + 28157823.

It is an arithmetic number, because the mean of its divisors is an integer number (1802086848).

Almost surely, 2^12220401221 is an apocalyptic number.

It is an amenable number.

12220401221 is a deficient number, since it is larger than the sum of its proper divisors (2196293563).

12220401221 is an equidigital number, since it uses as much as digits as its factorization.

12220401221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56315251.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12220401221 its reverse (12210402221), we get a palindrome (24430803442).

The spelling of 12220401221 in words is "twelve billion, two hundred twenty million, four hundred one thousand, two hundred twenty-one".