12221523 has 10 divisors (see below), whose sum is σ = 18256964. Its totient is φ = 8147628.

The previous prime is 12221519. The next prime is 12221527. The reversal of 12221523 is 32512221.

12221523 is a `hidden beast` number, since 122 + 21 + 523 = 666.

It is an interprime number because it is at equal distance from previous prime (12221519) and next prime (12221527).

It is not a de Polignac number, because 12221523 - 2² = 12221519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221496 and 12221505.

It is not an unprimeable number, because it can be changed into a prime (12221527) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 75361 + ... + 75522.

Almost surely, 2^12221523 is an apocalyptic number.

12221523 is a deficient number, since it is larger than the sum of its proper divisors (6035441).

12221523 is an equidigital number, since it uses as much as digits as its factorization.

12221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150895 (or 150886 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 12221523 is about 3495.9294901356. The cubic root of 12221523 is about 230.3430482607.

Adding to 12221523 its reverse (32512221), we get a palindrome (44733744).

The spelling of 12221523 in words is "twelve million, two hundred twenty-one thousand, five hundred twenty-three".