21331063261111 has 4 divisors (see below), whose sum is σ = 21368420640424. Its totient is φ = 21293705881800.

The previous prime is 21331063261097. The next prime is 21331063261127. The reversal of 21331063261111 is 11116236013312.

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 21331063261111 - 2⁹ = 21331063260599 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 (21331063261141) 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, 18678688800 + ... + 18678689941.

It is an arithmetic number, because the mean of its divisors is an integer number (5342105160106).

Almost surely, 2^{21331063261111} is an apocalyptic number.

21331063261111 is a deficient number, since it is larger than the sum of its proper divisors (37357379313).

21331063261111 is an equidigital number, since it uses as much as digits as its factorization.

21331063261111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37357379312.

The product of its (nonzero) digits is 3888, while the sum is 31.

Adding to 21331063261111 its reverse (11116236013312), we get a palindrome (32447299274423).

The spelling of 21331063261111 in words is "twenty-one trillion, three hundred thirty-one billion, sixty-three million, two hundred sixty-one thousand, one hundred eleven".