21331312123031 has 32 divisors (see below), whose sum is σ = 22477020920640. Its totient is φ = 20224658248704.

The previous prime is 21331312123001. The next prime is 21331312123057. The reversal of 21331312123031 is 13032121313312.

It is a cyclic number.

It is not a de Polignac number, because 21331312123031 - 2¹⁰ = 21331312122007 is a prime.

It is a super-2 number, since 2×21331312123031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331312123001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83240165 + ... + 83496033.

It is an arithmetic number, because the mean of its divisors is an integer number (702406903770).

Almost surely, 2^{21331312123031} is an apocalyptic number.

21331312123031 is a deficient number, since it is larger than the sum of its proper divisors (1145708797609).

21331312123031 is a wasteful number, since it uses less digits than its factorization.

21331312123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256355.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21331312123031 its reverse (13032121313312), we get a palindrome (34363433436343).

The spelling of 21331312123031 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred twelve million, one hundred twenty-three thousand, thirty-one".