21331223231011 has 16 divisors (see below), whose sum is σ = 22183534287360. Its totient is φ = 20486707476480.

The previous prime is 21331223230979. The next prime is 21331223231039. The reversal of 21331223231011 is 11013232213312.

It is a cyclic number.

It is not a de Polignac number, because 21331223231011 - 2⁵ = 21331223230979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331223231041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111310171 + ... + 111501643.

It is an arithmetic number, because the mean of its divisors is an integer number (1386470892960).

Almost surely, 2^{21331223231011} is an apocalyptic number.

21331223231011 is a deficient number, since it is larger than the sum of its proper divisors (852311056349).

21331223231011 is a wasteful number, since it uses less digits than its factorization.

21331223231011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211806.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21331223231011 its reverse (11013232213312), we get a palindrome (32344455444323).

The spelling of 21331223231011 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, eleven".