12156213 has 16 divisors (see below), whose sum is σ = 17329536. Its totient is φ = 7560960.

The previous prime is 12156211. The next prime is 12156217. The reversal of 12156213 is 31265121.

It is not a de Polignac number, because 12156213 - 2¹ = 12156211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12156213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681 + ... + 4977.

It is an arithmetic number, because the mean of its divisors is an integer number (1083096).

Almost surely, 2^12156213 is an apocalyptic number.

It is an amenable number.

12156213 is a deficient number, since it is larger than the sum of its proper divisors (5173323).

12156213 is a wasteful number, since it uses less digits than its factorization.

12156213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364.

The product of its digits is 360, while the sum is 21.

The square root of 12156213 is about 3486.5761141842. The cubic root of 12156213 is about 229.9320088884.

The spelling of 12156213 in words is "twelve million, one hundred fifty-six thousand, two hundred thirteen".