21424203142 has 8 divisors (see below), whose sum is σ = 32615951256. Its totient is φ = 10552219392.

The previous prime is 21424203121. The next prime is 21424203161. The reversal of 21424203142 is 24130242412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79940923 + ... + 79941190.

It is an arithmetic number, because the mean of its divisors is an integer number (4076993907).

Almost surely, 2^21424203142 is an apocalyptic number.

21424203142 is a deficient number, since it is larger than the sum of its proper divisors (11191748114).

21424203142 is a wasteful number, since it uses less digits than its factorization.

21424203142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159882182.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21424203142 its reverse (24130242412), we get a palindrome (45554445554).

The spelling of 21424203142 in words is "twenty-one billion, four hundred twenty-four million, two hundred three thousand, one hundred forty-two".