21142043012 has 12 divisors (see below), whose sum is σ = 36999854220. Its totient is φ = 10570656096.

The previous prime is 21142043011. The next prime is 21142043057. The reversal of 21142043012 is 21034024112.

It can be written as a sum of positive squares in 2 ways, for example, as 7013392516 + 14128650496 = 83746^2 + 118864^2 .

It is not an unprimeable number, because it can be changed into a prime (21142043011) 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, 70814 + ... + 217482.

It is an arithmetic number, because the mean of its divisors is an integer number (3083321185).

Almost surely, 2^21142043012 is an apocalyptic number.

It is an amenable number.

21142043012 is a deficient number, since it is larger than the sum of its proper divisors (15857811208).

21142043012 is a wasteful number, since it uses less digits than its factorization.

21142043012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182710 (or 182708 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21142043012 its reverse (21034024112), we get a palindrome (42176067124).

The spelling of 21142043012 in words is "twenty-one billion, one hundred forty-two million, forty-three thousand, twelve".