12220212221 has 8 divisors (see below), whose sum is σ = 14787483840. Its totient is φ = 9858322368.

The previous prime is 12220212217. The next prime is 12220212229. The reversal of 12220212221 is 12221202221.

It is a happy number.

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 12220212221 - 2² = 12220212217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 12220212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220212229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51345311 + ... + 51345548.

It is an arithmetic number, because the mean of its divisors is an integer number (1848435480).

Almost surely, 2^12220212221 is an apocalyptic number.

It is an amenable number.

12220212221 is a deficient number, since it is larger than the sum of its proper divisors (2567271619).

12220212221 is a wasteful number, since it uses less digits than its factorization.

12220212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102690883.

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

Adding to 12220212221 its reverse (12221202221), we get a palindrome (24441414442).

The spelling of 12220212221 in words is "twelve billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".