12025225521 has 16 divisors (see below), whose sum is σ = 18429465600. Its totient is φ = 7740374544.

The previous prime is 12025225507. The next prime is 12025225523. The reversal of 12025225521 is 12552252021.

It is a happy number.

It is not a de Polignac number, because 12025225521 - 2⁷ = 12025225393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12025225523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7678161 + ... + 7679726.

It is an arithmetic number, because the mean of its divisors is an integer number (1151841600).

Almost surely, 2^12025225521 is an apocalyptic number.

It is an amenable number.

12025225521 is a deficient number, since it is larger than the sum of its proper divisors (6404240079).

12025225521 is a wasteful number, since it uses less digits than its factorization.

12025225521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15357925 (or 15357919 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 12025225521 its reverse (12552252021), we get a palindrome (24577477542).

The spelling of 12025225521 in words is "twelve billion, twenty-five million, two hundred twenty-five thousand, five hundred twenty-one".