21131300242031 has 32 divisors (see below), whose sum is σ = 25684161085440. Its totient is φ = 16981904759904.

The previous prime is 21131300242021. The next prime is 21131300242037. The reversal of 21131300242031 is 13024200313112.

It is not a de Polignac number, because 21131300242031 - 2¹⁴ = 21131300225647 is a prime.

It is a super-2 number, since 2×21131300242031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131300241988 and 21131300242006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131300242037) 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 31 ways as a sum of consecutive naturals, for example, 21198296 + ... + 22172738.

It is an arithmetic number, because the mean of its divisors is an integer number (802630033920).

Almost surely, 2^{21131300242031} is an apocalyptic number.

21131300242031 is a deficient number, since it is larger than the sum of its proper divisors (4552860843409).

21131300242031 is a wasteful number, since it uses less digits than its factorization.

21131300242031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976155.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21131300242031 its reverse (13024200313112), we get a palindrome (34155500555143).

The spelling of 21131300242031 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred million, two hundred forty-two thousand, thirty-one".