13221403555212 has 96 divisors (see below), whose sum is σ = 35081739221760. Its totient is φ = 4303799861760.

The previous prime is 13221403555153. The next prime is 13221403555219. The reversal of 13221403555212 is 21255530412231.

13221403555212 is a `hidden beast` number, since 1 + 3 + 2 + 21 + 40 + 35 + 552 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (13221403555219) 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, 23654287 + ... + 24206777.

It is an arithmetic number, because the mean of its divisors is an integer number (365434783560).

Almost surely, 2^{13221403555212} is an apocalyptic number.

13221403555212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13221403555212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17540869610880).

13221403555212 is an abundant number, since it is smaller than the sum of its proper divisors (21860335666548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221403555212 is a wasteful number, since it uses less digits than its factorization.

13221403555212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557700 (or 557692 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 13221403555212 its reverse (21255530412231), we get a palindrome (34476933967443).

The spelling of 13221403555212 in words is "thirteen trillion, two hundred twenty-one billion, four hundred three million, five hundred fifty-five thousand, two hundred twelve".