21443143131 has 24 divisors (see below), whose sum is σ = 31743968256. Its totient is φ = 13940127360.

The previous prime is 21443143129. The next prime is 21443143153. The reversal of 21443143131 is 13134134412.

21443143131 is a `hidden beast` number, since 214 + 4 + 314 + 3 + 131 = 666.

It is not a de Polignac number, because 21443143131 - 2¹ = 21443143129 is a prime.

It is a super-2 number, since 2×21443143131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21443143095 and 21443143104.

It is not an unprimeable number, because it can be changed into a prime (21443143231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 833446 + ... + 858788.

It is an arithmetic number, because the mean of its divisors is an integer number (1322665344).

Almost surely, 2^21443143131 is an apocalyptic number.

21443143131 is a deficient number, since it is larger than the sum of its proper divisors (10300825125).

21443143131 is a wasteful number, since it uses less digits than its factorization.

21443143131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27683 (or 27680 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 21443143131 its reverse (13134134412), we get a palindrome (34577277543).

The spelling of 21443143131 in words is "twenty-one billion, four hundred forty-three million, one hundred forty-three thousand, one hundred thirty-one".