12155022117 has 24 divisors (see below), whose sum is σ = 21245754816. Its totient is φ = 6537154176.

The previous prime is 12155022101. The next prime is 12155022127. The reversal of 12155022117 is 71122055121.

12155022117 is a `hidden beast` number, since 121 + 5 + 502 + 21 + 17 = 666.

It is not a de Polignac number, because 12155022117 - 2⁴ = 12155022101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155022127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5673543 + ... + 5675684.

It is an arithmetic number, because the mean of its divisors is an integer number (885239784).

Almost surely, 2^12155022117 is an apocalyptic number.

12155022117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12155022117 is a deficient number, since it is larger than the sum of its proper divisors (9090732699).

12155022117 is a wasteful number, since it uses less digits than its factorization.

12155022117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11349257 (or 11349254 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

Adding to 12155022117 its reverse (71122055121), we get a palindrome (83277077238).

The spelling of 12155022117 in words is "twelve billion, one hundred fifty-five million, twenty-two thousand, one hundred seventeen".