21431131041 has 4 divisors (see below), whose sum is σ = 28574841392. Its totient is φ = 14287420692.

The previous prime is 21431131021. The next prime is 21431131049. The reversal of 21431131041 is 14013113412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21431131041 - 2²⁹ = 20894260129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21431130999 and 21431131017.

It is not an unprimeable number, because it can be changed into a prime (21431131049) 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 3 ways as a sum of consecutive naturals, for example, 3571855171 + ... + 3571855176.

It is an arithmetic number, because the mean of its divisors is an integer number (7143710348).

Almost surely, 2^21431131041 is an apocalyptic number.

It is an amenable number.

21431131041 is a deficient number, since it is larger than the sum of its proper divisors (7143710351).

21431131041 is an equidigital number, since it uses as much as digits as its factorization.

21431131041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143710350.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21431131041 its reverse (14013113412), we get a palindrome (35444244453).

The spelling of 21431131041 in words is "twenty-one billion, four hundred thirty-one million, one hundred thirty-one thousand, forty-one".