13221404012225 has 12 divisors (see below), whose sum is σ = 16417664468220. Its totient is φ = 10562204827200.

The previous prime is 13221404012203. The next prime is 13221404012263. The reversal of 13221404012225 is 52221040412231.

It can be written as a sum of positive squares in 6 ways, for example, as 3539455246336 + 9681948765889 = 1881344^2 + 3111583^2 .

It is not a de Polignac number, because 13221404012225 - 2¹⁰ = 13221404011201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 372941486 + ... + 372976935.

It is an arithmetic number, because the mean of its divisors is an integer number (1368138705685).

Almost surely, 2^{13221404012225} is an apocalyptic number.

It is an amenable number.

13221404012225 is a deficient number, since it is larger than the sum of its proper divisors (3196260455995).

13221404012225 is an equidigital number, since it uses as much as digits as its factorization.

13221404012225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745919140 (or 745919135 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 13221404012225 its reverse (52221040412231), we get a palindrome (65442444424456).

The spelling of 13221404012225 in words is "thirteen trillion, two hundred twenty-one billion, four hundred four million, twelve thousand, two hundred twenty-five".