12215001221 has 8 divisors (see below), whose sum is σ = 12686336640. Its totient is φ = 11752475968.

The previous prime is 12215001203. The next prime is 12215001263. The reversal of 12215001221 is 12210051221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12215001221 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 12215001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215009221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2199716 + ... + 2205261.

It is an arithmetic number, because the mean of its divisors is an integer number (1585792080).

Almost surely, 2^12215001221 is an apocalyptic number.

It is an amenable number.

12215001221 is a deficient number, since it is larger than the sum of its proper divisors (471335419).

12215001221 is an equidigital number, since it uses as much as digits as its factorization.

12215001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405083.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 12215001221 its reverse (12210051221), we get a palindrome (24425052442).

The spelling of 12215001221 in words is "twelve billion, two hundred fifteen million, one thousand, two hundred twenty-one".