12465500921 has 4 divisors (see below), whose sum is σ = 12465868644. Its totient is φ = 12465133200.

The previous prime is 12465500917. The next prime is 12465500933. The reversal of 12465500921 is 12900556421.

It is a happy number.

12465500921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12900556421 = 19687 ⋅655283.

It can be written as a sum of positive squares in 2 ways, for example, as 11106841321 + 1358659600 = 105389^2 + 36860^2 .

It is a cyclic number.

It is not a de Polignac number, because 12465500921 - 2² = 12465500917 is a prime.

It is a super-2 number, since 2×12465500921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12465500521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127190 + ... + 202751.

It is an arithmetic number, because the mean of its divisors is an integer number (3116467161).

Almost surely, 2^12465500921 is an apocalyptic number.

It is an amenable number.

12465500921 is a deficient number, since it is larger than the sum of its proper divisors (367723).

12465500921 is an equidigital number, since it uses as much as digits as its factorization.

12465500921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367722.

The product of its (nonzero) digits is 21600, while the sum is 35.

It can be divided in two parts, 12465500 and 921, that added together give a palindrome (12466421).

The spelling of 12465500921 in words is "twelve billion, four hundred sixty-five million, five hundred thousand, nine hundred twenty-one".