22012171872 has 48 divisors (see below), whose sum is σ = 58081388400. Its totient is φ = 7299366912.

The previous prime is 22012171849. The next prime is 22012171877. The reversal of 22012171872 is 27817121022.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012171877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575497 + ... + 612552.

It is an arithmetic number, because the mean of its divisors is an integer number (1210028925).

Almost surely, 2^22012171872 is an apocalyptic number.

It is an amenable number.

22012171872 is an abundant number, since it is smaller than the sum of its proper divisors (36069216528).

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

22012171872 is a wasteful number, since it uses less digits than its factorization.

22012171872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188255 (or 1188247 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

Adding to 22012171872 its reverse (27817121022), we get a palindrome (49829292894).

The spelling of 22012171872 in words is "twenty-two billion, twelve million, one hundred seventy-one thousand, eight hundred seventy-two".