21142432143 has 36 divisors (see below), whose sum is σ = 37614760560. Its totient is φ = 11370715776.

The previous prime is 21142432127. The next prime is 21142432151. The reversal of 21142432143 is 34123424112.

21142432143 is a `hidden beast` number, since 21 + 1 + 424 + 3 + 214 + 3 = 666.

It is not a de Polignac number, because 21142432143 - 2⁴ = 21142432127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142432193) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1402563 + ... + 1417556.

It is an arithmetic number, because the mean of its divisors is an integer number (1044854460).

Almost surely, 2^21142432143 is an apocalyptic number.

21142432143 is a deficient number, since it is larger than the sum of its proper divisors (16472328417).

21142432143 is a wasteful number, since it uses less digits than its factorization.

21142432143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820156 (or 2820146 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21142432143 its reverse (34123424112), we get a palindrome (55265856255).

The spelling of 21142432143 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty-two thousand, one hundred forty-three".