21031331243031 has 12 divisors (see below), whose sum is σ = 32165565430752. Its totient is φ = 13196129407296.

The previous prime is 21031331242937. The next prime is 21031331243081. The reversal of 21031331243031 is 13034213313012.

21031331243031 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 1 + 331 + 24 + 303 + 1 = 666.

It is not a de Polignac number, because 21031331243031 - 2¹³ = 21031331234839 is a prime.

It is a super-2 number, since 2×21031331243031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21031331242986 and 21031331243004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031331243081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68729840511 + ... + 68729840816.

It is an arithmetic number, because the mean of its divisors is an integer number (2680463785896).

Almost surely, 2^{21031331243031} is an apocalyptic number.

21031331243031 is a deficient number, since it is larger than the sum of its proper divisors (11134234187721).

21031331243031 is a wasteful number, since it uses less digits than its factorization.

21031331243031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137459681350 (or 137459681347 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 21031331243031 its reverse (13034213313012), we get a palindrome (34065544556043).

The spelling of 21031331243031 in words is "twenty-one trillion, thirty-one billion, three hundred thirty-one million, two hundred forty-three thousand, thirty-one".