13216221442 has 16 divisors (see below), whose sum is σ = 20016473400. Its totient is φ = 6544126080.

The previous prime is 13216221439. The next prime is 13216221449. The reversal of 13216221442 is 24412261231.

It can be written as a sum of positive squares in 4 ways, for example, as 12385686681 + 830534761 = 111291^2 + 28819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13216221442.

It is not an unprimeable number, because it can be changed into a prime (13216221449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440892 + ... + 469912.

Almost surely, 2^13216221442 is an apocalyptic number.

13216221442 is a deficient number, since it is larger than the sum of its proper divisors (6800251958).

13216221442 is a wasteful number, since it uses less digits than its factorization.

13216221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31221.

The product of its digits is 4608, while the sum is 28.

Adding to 13216221442 its reverse (24412261231), we get a palindrome (37628482673).

The spelling of 13216221442 in words is "thirteen billion, two hundred sixteen million, two hundred twenty-one thousand, four hundred forty-two".