12155154012 has 144 divisors (see below), whose sum is σ = 33546472960. Its totient is φ = 3697674624.

The previous prime is 12155153999. The next prime is 12155154013. The reversal of 12155154012 is 21045155121.

It is a happy number.

It is a super-2 number, since 2×12155154012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155154013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2604393 + ... + 2609055.

Almost surely, 2^12155154012 is an apocalyptic number.

12155154012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12155154012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16773236480).

12155154012 is an abundant number, since it is smaller than the sum of its proper divisors (21391318948).

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

12155154012 is a wasteful number, since it uses less digits than its factorization.

12155154012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832 (or 4827 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 12155154012 in words is "twelve billion, one hundred fifty-five million, one hundred fifty-four thousand, twelve".