21331320011111 has 16 divisors (see below), whose sum is σ = 23302763313408. Its totient is φ = 19365250833600.

The previous prime is 21331320011101. The next prime is 21331320011159. The reversal of 21331320011111 is 11111002313312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331320011111 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 (21331320011101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404381840 + ... + 404434586.

It is an arithmetic number, because the mean of its divisors is an integer number (1456422707088).

Almost surely, 2^{21331320011111} is an apocalyptic number.

21331320011111 is a deficient number, since it is larger than the sum of its proper divisors (1971443302297).

21331320011111 is a wasteful number, since it uses less digits than its factorization.

21331320011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102982.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21331320011111 its reverse (11111002313312), we get a palindrome (32442322324423).

The spelling of 21331320011111 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred twenty million, eleven thousand, one hundred eleven".