21113203032311 has 4 divisors (see below), whose sum is σ = 22737295573272. Its totient is φ = 19489110491352.

The previous prime is 21113203032293. The next prime is 21113203032323. The reversal of 21113203032311 is 11323030231112.

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 21113203032311 - 2⁶ = 21113203032247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113203032011) 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, 812046270461 + ... + 812046270486.

It is an arithmetic number, because the mean of its divisors is an integer number (5684323893318).

Almost surely, 2^{21113203032311} is an apocalyptic number.

21113203032311 is a deficient number, since it is larger than the sum of its proper divisors (1624092540961).

21113203032311 is a wasteful number, since it uses less digits than its factorization.

21113203032311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624092540960.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21113203032311 its reverse (11323030231112), we get a palindrome (32436233263423).

The spelling of 21113203032311 in words is "twenty-one trillion, one hundred thirteen billion, two hundred three million, thirty-two thousand, three hundred eleven".