12220155 has 24 divisors (see below), whose sum is σ = 21264048. Its totient is φ = 6492096.

The previous prime is 12220147. The next prime is 12220171. The reversal of 12220155 is 55102221.

It is not a de Polignac number, because 12220155 - 2³ = 12220147 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19629 + ... + 20241.

It is an arithmetic number, because the mean of its divisors is an integer number (886002).

Almost surely, 2^12220155 is an apocalyptic number.

12220155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12220155 is a deficient number, since it is larger than the sum of its proper divisors (9043893).

12220155 is a wasteful number, since it uses less digits than its factorization.

12220155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 1064 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12220155 is about 3495.7338285402. The cubic root of 12220155 is about 230.3344535586.

Adding to 12220155 its reverse (55102221), we get a palindrome (67322376).

The spelling of 12220155 in words is "twelve million, two hundred twenty thousand, one hundred fifty-five".