12155216 has 10 divisors (see below), whose sum is σ = 23550762. Its totient is φ = 6077600.

The previous prime is 12155191. The next prime is 12155237. The reversal of 12155216 is 61255121.

It is a happy number.

12155216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7728400 + 4426816 = 2780^2 + 2104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12155191 and 12155200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 379835 + ... + 379866.

Almost surely, 2^12155216 is an apocalyptic number.

12155216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12155216 is a deficient number, since it is larger than the sum of its proper divisors (11395546).

12155216 is an equidigital number, since it uses as much as digits as its factorization.

12155216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759709 (or 759703 counting only the distinct ones).

The product of its digits is 600, while the sum is 23.

The square root of 12155216 is about 3486.4331343079. The cubic root of 12155216 is about 229.9257227070.

The spelling of 12155216 in words is "twelve million, one hundred fifty-five thousand, two hundred sixteen".