13221221140 has 24 divisors (see below), whose sum is σ = 27775048392. Its totient is φ = 5286491520.

The previous prime is 13221221089. The next prime is 13221221171. The reversal of 13221221140 is 4112212231.

It can be written as a sum of positive squares in 4 ways, for example, as 111429136 + 13109792004 = 10556^2 + 114498^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69931 + ... + 177010.

It is an arithmetic number, because the mean of its divisors is an integer number (1157293683).

Almost surely, 2^13221221140 is an apocalyptic number.

13221221140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13221221140 is an abundant number, since it is smaller than the sum of its proper divisors (14553827252).

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

13221221140 is a wasteful number, since it uses less digits than its factorization.

13221221140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249627 (or 249625 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 13221221140 its reverse (4112212231), we get a palindrome (17333433371).

The spelling of 13221221140 in words is "thirteen billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred forty".