21113044411 has 4 divisors (see below), whose sum is σ = 21113349400. Its totient is φ = 21112739424.

The previous prime is 21113044391. The next prime is 21113044439. The reversal of 21113044411 is 11444031112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21113044411 - 2²⁷ = 20978826683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113044471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6835 + ... + 205603.

It is an arithmetic number, because the mean of its divisors is an integer number (5278337350).

Almost surely, 2^21113044411 is an apocalyptic number.

21113044411 is a deficient number, since it is larger than the sum of its proper divisors (304989).

21113044411 is a wasteful number, since it uses less digits than its factorization.

21113044411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304988.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21113044411 its reverse (11444031112), we get a palindrome (32557075523).

The spelling of 21113044411 in words is "twenty-one billion, one hundred thirteen million, forty-four thousand, four hundred eleven".