13111221042 has 12 divisors (see below), whose sum is σ = 28407645630. Its totient is φ = 4370407008.

The previous prime is 13111221029. The next prime is 13111221061. The reversal of 13111221042 is 24012211131.

It can be written as a sum of positive squares in only one way, i.e., 9761242401 + 3349978641 = 98799^2 + 57879^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 728401169 = 13111221042 / (1 + 3 + 1 + 1 + 1 + 2 + 2 + 1 + 0 + 4 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364200567 + ... + 364200602.

Almost surely, 2^13111221042 is an apocalyptic number.

13111221042 is an abundant number, since it is smaller than the sum of its proper divisors (15296424588).

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

13111221042 is a wasteful number, since it uses less digits than its factorization.

13111221042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728401177 (or 728401174 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 13111221042 its reverse (24012211131), we get a palindrome (37123432173).

The spelling of 13111221042 in words is "thirteen billion, one hundred eleven million, two hundred twenty-one thousand, forty-two".