12212155 has 8 divisors (see below), whose sum is σ = 15426000. Its totient is φ = 9255456.

The previous prime is 12212147. The next prime is 12212159. The reversal of 12212155 is 55121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12212155 - 2³ = 12212147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (12212159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64180 + ... + 64369.

It is an arithmetic number, because the mean of its divisors is an integer number (1928250).

Almost surely, 2^12212155 is an apocalyptic number.

12212155 is a deficient number, since it is larger than the sum of its proper divisors (3213845).

12212155 is a wasteful number, since it uses less digits than its factorization.

12212155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128573.

The product of its digits is 200, while the sum is 19.

The square root of 12212155 is about 3494.5893893275. The cubic root of 12212155 is about 230.2841792950.

Adding to 12212155 its reverse (55121221), we get a palindrome (67333376).

The spelling of 12212155 in words is "twelve million, two hundred twelve thousand, one hundred fifty-five".