12220021221 has 8 divisors (see below), whose sum is σ = 16350936480. Its totient is φ = 8117893392.

The previous prime is 12220021207. The next prime is 12220021241. The reversal of 12220021221 is 12212002221.

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

It is not a de Polignac number, because 12220021221 - 2¹⁸ = 12219759077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12220021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220021241) 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, 7195866 + ... + 7197563.

It is an arithmetic number, because the mean of its divisors is an integer number (2043867060).

Almost surely, 2^12220021221 is an apocalyptic number.

It is an amenable number.

12220021221 is a deficient number, since it is larger than the sum of its proper divisors (4130915259).

12220021221 is a wasteful number, since it uses less digits than its factorization.

12220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14393715.

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

Adding to 12220021221 its reverse (12212002221), we get a palindrome (24432023442).

The spelling of 12220021221 in words is "twelve billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".