12440948521 has 3 divisors (see below), whose sum is σ = 12441060061. Its totient is φ = 12440836982.

The previous prime is 12440948501. The next prime is 12440948537. The reversal of 12440948521 is 12584904421.

The square root of 12440948521 is 111539.

It is a perfect power (a square), and thus also a powerful number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12584904421 = 73351 ⋅171571.

It is not a de Polignac number, because 12440948521 - 2¹⁷ = 12440817449 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440948501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55770 + ... + 167308.

Almost surely, 2^12440948521 is an apocalyptic number.

12440948521 is the 111539-th square number.

12440948521 is the 55770-th centered octagonal number.

It is an amenable number.

12440948521 is a deficient number, since it is larger than the sum of its proper divisors (111540).

12440948521 is an frugal number, since it uses more digits than its factorization.

12440948521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223078 (or 111539 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 12440948521 in words is "twelve billion, four hundred forty million, nine hundred forty-eight thousand, five hundred twenty-one".