13221451112505 has 32 divisors (see below), whose sum is σ = 21503111212800. Its totient is φ = 6935198926080.

The previous prime is 13221451112503. The next prime is 13221451112537. The reversal of 13221451112505 is 50521115412231.

It is not a de Polignac number, because 13221451112505 - 2¹ = 13221451112503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13221451112503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9264796 + ... + 10596194.

It is an arithmetic number, because the mean of its divisors is an integer number (671972225400).

Almost surely, 2^{13221451112505} is an apocalyptic number.

13221451112505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13221451112505 is a deficient number, since it is larger than the sum of its proper divisors (8281660100295).

13221451112505 is a wasteful number, since it uses less digits than its factorization.

13221451112505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342321.

The product of its (nonzero) digits is 12000, while the sum is 33.

Adding to 13221451112505 its reverse (50521115412231), we get a palindrome (63742566524736).

The spelling of 13221451112505 in words is "thirteen trillion, two hundred twenty-one billion, four hundred fifty-one million, one hundred twelve thousand, five hundred five".