21113203411 has 4 divisors (see below), whose sum is σ = 21113554000. Its totient is φ = 21112852824.

The previous prime is 21113203367. The next prime is 21113203457. The reversal of 21113203411 is 11430231112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21113203411 - 2⁷ = 21113203283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113203711) 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, 59436 + ... + 213913.

It is an arithmetic number, because the mean of its divisors is an integer number (5278388500).

Almost surely, 2^21113203411 is an apocalyptic number.

21113203411 is a deficient number, since it is larger than the sum of its proper divisors (350589).

21113203411 is an equidigital number, since it uses as much as digits as its factorization.

21113203411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350588.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21113203411 its reverse (11430231112), we get a palindrome (32543434523).

The spelling of 21113203411 in words is "twenty-one billion, one hundred thirteen million, two hundred three thousand, four hundred eleven".