12521223 has 80 divisors (see below), whose sum is σ = 23417856. Its totient is φ = 6557760.

The previous prime is 12521219. The next prime is 12521233. The reversal of 12521223 is 32212521.

It is not a de Polignac number, because 12521223 - 2² = 12521219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12521196 and 12521205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521203) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 266386 + ... + 266432.

Almost surely, 2^12521223 is an apocalyptic number.

12521223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12521223 is a deficient number, since it is larger than the sum of its proper divisors (10896633).

12521223 is a wasteful number, since it uses less digits than its factorization.

12521223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 97 counting only the distinct ones).

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

The square root of 12521223 is about 3538.5340184884. The cubic root of 12521223 is about 232.2107120031.

Adding to 12521223 its reverse (32212521), we get a palindrome (44733744).

The spelling of 12521223 in words is "twelve million, five hundred twenty-one thousand, two hundred twenty-three".