12102122172 has 48 divisors (see below), whose sum is σ = 32518708992. Its totient is φ = 3431351040.

The previous prime is 12102122161. The next prime is 12102122173. The reversal of 12102122172 is 27122120121.

It is a super-2 number, since 2×12102122172² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102122173) 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, 538893 + ... + 560900.

It is an arithmetic number, because the mean of its divisors is an integer number (677473104).

Almost surely, 2^12102122172 is an apocalyptic number.

12102122172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12102122172 is an abundant number, since it is smaller than the sum of its proper divisors (20416586820).

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

12102122172 is a wasteful number, since it uses less digits than its factorization.

12102122172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099938 (or 1099936 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 12102122172 its reverse (27122120121), we get a palindrome (39224242293).

The spelling of 12102122172 in words is "twelve billion, one hundred two million, one hundred twenty-two thousand, one hundred seventy-two".