20111133442 has 4 divisors (see below), whose sum is σ = 30166700166. Its totient is φ = 10055566720.

The previous prime is 20111133431. The next prime is 20111133443. The reversal of 20111133442 is 24433111102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24433111102 = 2 ⋅12216555551.

It can be written as a sum of positive squares in only one way, i.e., 19118316361 + 992817081 = 138269^2 + 31509^2 .

It is not an unprimeable number, because it can be changed into a prime (20111133443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5027783359 + ... + 5027783362.

Almost surely, 2^20111133442 is an apocalyptic number.

20111133442 is a deficient number, since it is larger than the sum of its proper divisors (10055566724).

20111133442 is a wasteful number, since it uses less digits than its factorization.

20111133442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055566723.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20111133442 its reverse (24433111102), we get a palindrome (44544244544).

The spelling of 20111133442 in words is "twenty billion, one hundred eleven million, one hundred thirty-three thousand, four hundred forty-two".