21131431212331 has 8 divisors (see below), whose sum is σ = 24054751736064. Its totient is φ = 18375157575720.

The previous prime is 21131431212319. The next prime is 21131431212371. The reversal of 21131431212331 is 13321213413112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21131431212331 - 2¹⁷ = 21131431081259 is a prime.

It is a super-2 number, since 2×21131431212331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21131431212331.

It is not an unprimeable number, because it can be changed into a prime (21131431212371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41761721511 + ... + 41761722016.

It is an arithmetic number, because the mean of its divisors is an integer number (3006843967008).

Almost surely, 2^{21131431212331} is an apocalyptic number.

21131431212331 is a deficient number, since it is larger than the sum of its proper divisors (2923320523733).

21131431212331 is a wasteful number, since it uses less digits than its factorization.

21131431212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83523443561.

The product of its digits is 2592, while the sum is 28.

Adding to 21131431212331 its reverse (13321213413112), we get a palindrome (34452644625443).

The spelling of 21131431212331 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty-one million, two hundred twelve thousand, three hundred thirty-one".