12221267172 has 48 divisors (see below), whose sum is σ = 30174412800. Its totient is φ = 3839127840.

The previous prime is 12221267171. The next prime is 12221267213. The reversal of 12221267172 is 27176212221.

It is not an unprimeable number, because it can be changed into a prime (12221267171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96772 + ... + 183867.

It is an arithmetic number, because the mean of its divisors is an integer number (628633600).

Almost surely, 2^12221267172 is an apocalyptic number.

12221267172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12221267172 is an abundant number, since it is smaller than the sum of its proper divisors (17953145628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221267172 is a wasteful number, since it uses less digits than its factorization.

12221267172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280856 (or 280854 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

Adding to 12221267172 its reverse (27176212221), we get a palindrome (39397479393).

The spelling of 12221267172 in words is "twelve billion, two hundred twenty-one million, two hundred sixty-seven thousand, one hundred seventy-two".