21432143042 has 8 divisors (see below), whose sum is σ = 32219815500. Its totient is φ = 10692204544.

The previous prime is 21432143041. The next prime is 21432143063. The reversal of 21432143042 is 24034123412.

It can be written as a sum of positive squares in 2 ways, for example, as 20981812201 + 450330841 = 144851^2 + 21221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21432143041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11932367 + ... + 11934162.

Almost surely, 2^21432143042 is an apocalyptic number.

21432143042 is a deficient number, since it is larger than the sum of its proper divisors (10787672458).

21432143042 is a wasteful number, since it uses less digits than its factorization.

21432143042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23866980.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21432143042 its reverse (24034123412), we get a palindrome (45466266454).

The spelling of 21432143042 in words is "twenty-one billion, four hundred thirty-two million, one hundred forty-three thousand, forty-two".