21113440042 has 16 divisors (see below), whose sum is σ = 33053614272. Its totient is φ = 10095748960.

The previous prime is 21113440039. The next prime is 21113440043. The reversal of 21113440042 is 24004431112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21113439995 and 21113440022.

It is not an unprimeable number, because it can be changed into a prime (21113440043) 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, 206817 + ... + 291547.

It is an arithmetic number, because the mean of its divisors is an integer number (2065850892).

Almost surely, 2^21113440042 is an apocalyptic number.

21113440042 is a deficient number, since it is larger than the sum of its proper divisors (11940174230).

21113440042 is a wasteful number, since it uses less digits than its factorization.

21113440042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90173.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21113440042 its reverse (24004431112), we get a palindrome (45117871154).

The spelling of 21113440042 in words is "twenty-one billion, one hundred thirteen million, four hundred forty thousand, forty-two".