12155411220 has 48 divisors (see below), whose sum is σ = 35514944640. Its totient is φ = 3100510336.

The previous prime is 12155411207. The next prime is 12155411263. The reversal of 12155411220 is 2211455121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4402755 + ... + 4405514.

It is an arithmetic number, because the mean of its divisors is an integer number (739894680).

Almost surely, 2^12155411220 is an apocalyptic number.

12155411220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155411220 is an abundant number, since it is smaller than the sum of its proper divisors (23359533420).

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

12155411220 is a wasteful number, since it uses less digits than its factorization.

12155411220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8808304 (or 8808302 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 12155411220 its reverse (2211455121), we get a palindrome (14366866341).

The spelling of 12155411220 in words is "twelve billion, one hundred fifty-five million, four hundred eleven thousand, two hundred twenty".