12213151 has 4 divisors (see below), whose sum is σ = 12221872. Its totient is φ = 12204432.

The previous prime is 12213137. The next prime is 12213167. The reversal of 12213151 is 15131221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12213151 - 2¹¹ = 12211103 is a prime.

It is a super-2 number, since 2×12213151² = 298322114697602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213251) 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, 1731 + ... + 5236.

It is an arithmetic number, because the mean of its divisors is an integer number (3055468).

Almost surely, 2^12213151 is an apocalyptic number.

12213151 is a deficient number, since it is larger than the sum of its proper divisors (8721).

12213151 is an equidigital number, since it uses as much as digits as its factorization.

12213151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8720.

The product of its digits is 60, while the sum is 16.

The square root of 12213151 is about 3494.7318924347. The cubic root of 12213151 is about 230.2904396372.

Adding to 12213151 its reverse (15131221), we get a palindrome (27344372).

The spelling of 12213151 in words is "twelve million, two hundred thirteen thousand, one hundred fifty-one".