21342143131 has 4 divisors (see below), whose sum is σ = 21342440392. Its totient is φ = 21341845872.

The previous prime is 21342143107. The next prime is 21342143149. The reversal of 21342143131 is 13134124312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342143131 is a prime.

It is a super-2 number, since 2×21342143131² (a number of 21 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 = 21342143096 and 21342143105.

It is not an unprimeable number, because it can be changed into a prime (21342173131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33271 + ... + 209263.

It is an arithmetic number, because the mean of its divisors is an integer number (5335610098).

Almost surely, 2^21342143131 is an apocalyptic number.

21342143131 is a deficient number, since it is larger than the sum of its proper divisors (297261).

21342143131 is a wasteful number, since it uses less digits than its factorization.

21342143131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297260.

The product of its digits is 1728, while the sum is 25.

Adding to 21342143131 its reverse (13134124312), we get a palindrome (34476267443).

The spelling of 21342143131 in words is "twenty-one billion, three hundred forty-two million, one hundred forty-three thousand, one hundred thirty-one".