13887221008 has 10 divisors (see below), whose sum is σ = 26906490734. Its totient is φ = 6943610496.

The previous prime is 13887221003. The next prime is 13887221041. The reversal of 13887221008 is 80012278831.

It can be written as a sum of positive squares in only one way, i.e., 12177563904 + 1709657104 = 110352^2 + 41348^2 .

It is not an unprimeable number, because it can be changed into a prime (13887221003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433975641 + ... + 433975672.

Almost surely, 2^13887221008 is an apocalyptic number.

It is an amenable number.

13887221008 is a deficient number, since it is larger than the sum of its proper divisors (13019269726).

13887221008 is an equidigital number, since it uses as much as digits as its factorization.

13887221008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867951321 (or 867951315 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

Adding to 13887221008 its reverse (80012278831), we get a palindrome (93899499839).

The spelling of 13887221008 in words is "thirteen billion, eight hundred eighty-seven million, two hundred twenty-one thousand, eight".