12102122178 has 24 divisors (see below), whose sum is σ = 27067113216. Its totient is φ = 3903910200.

The previous prime is 12102122177. The next prime is 12102122191. The reversal of 12102122178 is 87122120121.

It is a happy number.

It is a super-2 number, since 2×12102122178² (a number of 21 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 10843638 + ... + 10844753.

It is an arithmetic number, because the mean of its divisors is an integer number (1127796384).

Almost surely, 2^12102122178 is an apocalyptic number.

12102122178 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12102122178 is an abundant number, since it is smaller than the sum of its proper divisors (14964991038).

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

12102122178 is a wasteful number, since it uses less digits than its factorization.

12102122178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21688430 (or 21688427 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

Adding to 12102122178 its reverse (87122120121), we get a palindrome (99224242299).

The spelling of 12102122178 in words is "twelve billion, one hundred two million, one hundred twenty-two thousand, one hundred seventy-eight".