21131123323311 has 12 divisors (see below), whose sum is σ = 30530118870888. Its totient is φ = 14084007003504.

The previous prime is 21131123323187. The next prime is 21131123323313. The reversal of 21131123323311 is 11332332113112.

21131123323311 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 1 + 23 + 323 + 311 = 666.

It is not a de Polignac number, because 21131123323311 - 2⁷ = 21131123323183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131123323313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284006185 + ... + 284080578.

It is an arithmetic number, because the mean of its divisors is an integer number (2544176572574).

Almost surely, 2^{21131123323311} is an apocalyptic number.

21131123323311 is a deficient number, since it is larger than the sum of its proper divisors (9398995547577).

21131123323311 is a wasteful number, since it uses less digits than its factorization.

21131123323311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568090902 (or 568090899 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

Adding to 21131123323311 its reverse (11332332113112), we get a palindrome (32463455436423).

The spelling of 21131123323311 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred twenty-three million, three hundred twenty-three thousand, three hundred eleven".