12155213 has 4 divisors (see below), whose sum is σ = 13891680. Its totient is φ = 10418748.

The previous prime is 12155191. The next prime is 12155237. The reversal of 12155213 is 31255121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31255121 = 37 ⋅844733.

It is a cyclic number.

It is not a de Polignac number, because 12155213 - 2⁸ = 12154957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12152213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868223 + ... + 868236.

It is an arithmetic number, because the mean of its divisors is an integer number (3472920).

Almost surely, 2^12155213 is an apocalyptic number.

It is an amenable number.

12155213 is a deficient number, since it is larger than the sum of its proper divisors (1736467).

12155213 is an equidigital number, since it uses as much as digits as its factorization.

12155213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736466.

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

The square root of 12155213 is about 3486.4327040687. The cubic root of 12155213 is about 229.9257037912.

The spelling of 12155213 in words is "twelve million, one hundred fifty-five thousand, two hundred thirteen".