22171227712172 has 48 divisors (see below), whose sum is σ = 48396767666688. Its totient is φ = 8634001393920.

The previous prime is 22171227712159. The next prime is 22171227712199. The reversal of 22171227712172 is 27121772217122.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16603133 + ... + 17888724.

It is an arithmetic number, because the mean of its divisors is an integer number (1008265993056).

Almost surely, 2^{22171227712172} is an apocalyptic number.

22171227712172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22171227712172 is an abundant number, since it is smaller than the sum of its proper divisors (26225539954516).

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

22171227712172 is a wasteful number, since it uses less digits than its factorization.

22171227712172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34493966 (or 34493964 counting only the distinct ones).

The product of its digits is 153664, while the sum is 44.

Adding to 22171227712172 its reverse (27121772217122), we get a palindrome (49292999929294).

The spelling of 22171227712172 in words is "twenty-two trillion, one hundred seventy-one billion, two hundred twenty-seven million, seven hundred twelve thousand, one hundred seventy-two".