12216448538 has 8 divisors (see below), whose sum is σ = 20942483232. Its totient is φ = 5235620796.

The previous prime is 12216448511. The next prime is 12216448549. The reversal of 12216448538 is 83584461221.

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

It is a super-2 number, since 2×12216448538² (a number of 21 digits) contains 22 as substring.

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, 436301720 + ... + 436301747.

It is an arithmetic number, because the mean of its divisors is an integer number (2617810404).

Almost surely, 2^12216448538 is an apocalyptic number.

12216448538 is a deficient number, since it is larger than the sum of its proper divisors (8726034694).

12216448538 is an equidigital number, since it uses as much as digits as its factorization.

12216448538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872603476.

The product of its digits is 368640, while the sum is 44.

The spelling of 12216448538 in words is "twelve billion, two hundred sixteen million, four hundred forty-eight thousand, five hundred thirty-eight".