12021202221 has 16 divisors (see below), whose sum is σ = 18347635200. Its totient is φ = 6858153648.

The previous prime is 12021202217. The next prime is 12021202247. The reversal of 12021202221 is 12220212021.

It is not a de Polignac number, because 12021202221 - 2² = 12021202217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021206221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449391 + ... + 475388.

It is an arithmetic number, because the mean of its divisors is an integer number (1146727200).

Almost surely, 2^12021202221 is an apocalyptic number.

It is an amenable number.

12021202221 is a deficient number, since it is larger than the sum of its proper divisors (6326432979).

12021202221 is an equidigital number, since it uses as much as digits as its factorization.

12021202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925408.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12021202221 its reverse (12220212021), we get a palindrome (24241414242).

The spelling of 12021202221 in words is "twelve billion, twenty-one million, two hundred two thousand, two hundred twenty-one".