12215220117 has 4 divisors (see below), whose sum is σ = 16286960160. Its totient is φ = 8143480076.

The previous prime is 12215220041. The next prime is 12215220133. The reversal of 12215220117 is 71102251221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12215220117 - 2¹² = 12215216021 is a prime.

It is a super-2 number, since 2×12215220117² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215220187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2035870017 + ... + 2035870022.

It is an arithmetic number, because the mean of its divisors is an integer number (4071740040).

Almost surely, 2^12215220117 is an apocalyptic number.

It is an amenable number.

12215220117 is a deficient number, since it is larger than the sum of its proper divisors (4071740043).

12215220117 is an equidigital number, since it uses as much as digits as its factorization.

12215220117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071740042.

The product of its (nonzero) digits is 560, while the sum is 24.

Adding to 12215220117 its reverse (71102251221), we get a palindrome (83317471338).

The spelling of 12215220117 in words is "twelve billion, two hundred fifteen million, two hundred twenty thousand, one hundred seventeen".