12201215525 has 6 divisors (see below), whose sum is σ = 15129507282. Its totient is φ = 9760972400.

The previous prime is 12201215449. The next prime is 12201215549. The reversal of 12201215525 is 52551210221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 30492484 + 12170723041 = 5522^2 + 110321^2 .

It is not a de Polignac number, because 12201215525 - 2¹⁴ = 12201199141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201215494 and 12201215503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 244024286 + ... + 244024335.

It is an arithmetic number, because the mean of its divisors is an integer number (2521584547).

Almost surely, 2^12201215525 is an apocalyptic number.

It is an amenable number.

12201215525 is a deficient number, since it is larger than the sum of its proper divisors (2928291757).

12201215525 is an equidigital number, since it uses as much as digits as its factorization.

12201215525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488048631 (or 488048626 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 12201215525 its reverse (52551210221), we get a palindrome (64752425746).

The spelling of 12201215525 in words is "twelve billion, two hundred one million, two hundred fifteen thousand, five hundred twenty-five".