12122521 has 4 divisors (see below), whose sum is σ = 12136500. Its totient is φ = 12108544.

The previous prime is 12122507. The next prime is 12122533. The reversal of 12122521 is 12522121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12522121 = 19 ⋅659059.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 9363600 = 1661^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122521 - 2⁵ = 12122489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122495 and 12122504.

It is not an unprimeable number, because it can be changed into a prime (12122021) 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, 5596 + ... + 7453.

It is an arithmetic number, because the mean of its divisors is an integer number (3034125).

Almost surely, 2^12122521 is an apocalyptic number.

It is an amenable number.

12122521 is a deficient number, since it is larger than the sum of its proper divisors (13979).

12122521 is an equidigital number, since it uses as much as digits as its factorization.

12122521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13978.

The product of its digits is 80, while the sum is 16.

The square root of 12122521 is about 3481.7410874446. The cubic root of 12122521 is about 229.7193868236.

Adding to 12122521 its reverse (12522121), we get a palindrome (24644642).

The spelling of 12122521 in words is "twelve million, one hundred twenty-two thousand, five hundred twenty-one".