21331101111011 has 4 divisors (see below), whose sum is σ = 21331227546552. Its totient is φ = 21330974675472.

The previous prime is 21331101110999. The next prime is 21331101111037. The reversal of 21331101111011 is 11011110113312.

It is a happy number.

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 21331101111011 - 2¹⁸ = 21331100848867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331101111311) 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, 62964365 + ... + 63302238.

It is an arithmetic number, because the mean of its divisors is an integer number (5332806886638).

Almost surely, 2^{21331101111011} is an apocalyptic number.

21331101111011 is a deficient number, since it is larger than the sum of its proper divisors (126435541).

21331101111011 is a wasteful number, since it uses less digits than its factorization.

21331101111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126435540.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 21331101111011 its reverse (11011110113312), we get a palindrome (32342211224323).

The spelling of 21331101111011 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred one million, one hundred eleven thousand, eleven".