12445421225 has 12 divisors (see below), whose sum is σ = 15498562716. Its totient is φ = 9913601280.

The previous prime is 12445421213. The next prime is 12445421227. The reversal of 12445421225 is 52212454421.

It can be written as a sum of positive squares in 6 ways, for example, as 935564569 + 11509856656 = 30587^2 + 107284^2 .

It is not a de Polignac number, because 12445421225 - 2⁶ = 12445421161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12445421191 and 12445421200.

It is not an unprimeable number, because it can be changed into a prime (12445421227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1062452 + ... + 1074101.

It is an arithmetic number, because the mean of its divisors is an integer number (1291546893).

Almost surely, 2^12445421225 is an apocalyptic number.

It is an amenable number.

12445421225 is a deficient number, since it is larger than the sum of its proper divisors (3053141491).

12445421225 is a wasteful number, since it uses less digits than its factorization.

12445421225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136796 (or 2136791 counting only the distinct ones).

The product of its digits is 25600, while the sum is 32.

Adding to 12445421225 its reverse (52212454421), we get a palindrome (64657875646).

The spelling of 12445421225 in words is "twelve billion, four hundred forty-five million, four hundred twenty-one thousand, two hundred twenty-five".