21131324581707 has 24 divisors (see below), whose sum is σ = 30667734493344. Its totient is φ = 14020814530944.

The previous prime is 21131324581669. The next prime is 21131324581721. The reversal of 21131324581707 is 70718542313112.

21131324581707 is a `hidden beast` number, since 2 + 1 + 1 + 31 + 32 + 4 + 581 + 7 + 0 + 7 = 666.

It is not a de Polignac number, because 21131324581707 - 2⁶ = 21131324581643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21131324581207) 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 23 ways as a sum of consecutive naturals, for example, 2438658 + ... + 6943320.

It is an arithmetic number, because the mean of its divisors is an integer number (1277822270556).

Almost surely, 2^{21131324581707} is an apocalyptic number.

21131324581707 is a deficient number, since it is larger than the sum of its proper divisors (9536409911637).

21131324581707 is a wasteful number, since it uses less digits than its factorization.

21131324581707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507139 (or 4507136 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

Adding to 21131324581707 its reverse (70718542313112), we get a palindrome (91849866894819).

The spelling of 21131324581707 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred twenty-four million, five hundred eighty-one thousand, seven hundred seven".