12172342421522 has 8 divisors (see below), whose sum is σ = 18260572812336. Its totient is φ = 6085484817412.

The previous prime is 12172342421461. The next prime is 12172342421537. The reversal of 12172342421522 is 22512424327121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343174508 + ... + 343209975.

It is an arithmetic number, because the mean of its divisors is an integer number (2282571601542).

Almost surely, 2^{12172342421522} is an apocalyptic number.

12172342421522 is a deficient number, since it is larger than the sum of its proper divisors (6088230390814).

12172342421522 is an equidigital number, since it uses as much as digits as its factorization.

12172342421522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686393352.

The product of its digits is 107520, while the sum is 38.

Adding to 12172342421522 its reverse (22512424327121), we get a palindrome (34684766748643).

The spelling of 12172342421522 in words is "twelve trillion, one hundred seventy-two billion, three hundred forty-two million, four hundred twenty-one thousand, five hundred twenty-two".