12213155 has 4 divisors (see below), whose sum is σ = 14655792. Its totient is φ = 9770520.

The previous prime is 12213137. The next prime is 12213167. The reversal of 12213155 is 55131221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12213155 - 2⁸ = 12212899 is a prime.

It is a super-2 number, since 2×12213155² = 298322310108050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221311 + ... + 1221320.

It is an arithmetic number, because the mean of its divisors is an integer number (3663948).

Almost surely, 2^12213155 is an apocalyptic number.

12213155 is a deficient number, since it is larger than the sum of its proper divisors (2442637).

12213155 is an equidigital number, since it uses as much as digits as its factorization.

12213155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442636.

The product of its digits is 300, while the sum is 20.

The square root of 12213155 is about 3494.7324647246. The cubic root of 12213155 is about 230.2904647785.

Adding to 12213155 its reverse (55131221), we get a palindrome (67344376).

The spelling of 12213155 in words is "twelve million, two hundred thirteen thousand, one hundred fifty-five".