12152217 has 32 divisors (see below), whose sum is σ = 20865024. Its totient is φ = 6105600.

The previous prime is 12152213. The next prime is 12152221. The reversal of 12152217 is 71225121.

It is an interprime number because it is at equal distance from previous prime (12152213) and next prime (12152221).

It is not a de Polignac number, because 12152217 - 2² = 12152213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12152193 and 12152202.

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 31 ways as a sum of consecutive naturals, for example, 6313 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (652032).

Almost surely, 2^12152217 is an apocalyptic number.

It is an amenable number.

12152217 is a deficient number, since it is larger than the sum of its proper divisors (8712807).

12152217 is a wasteful number, since it uses less digits than its factorization.

12152217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749.

The product of its digits is 280, while the sum is 21.

The square root of 12152217 is about 3486.0030120469. The cubic root of 12152217 is about 229.9068116497.

Subtracting from 12152217 its sum of digits (21), we obtain a square (12152196 = 3486²).

Adding to 12152217 its reverse (71225121), we get a palindrome (83377338).

The spelling of 12152217 in words is "twelve million, one hundred fifty-two thousand, two hundred seventeen".