21000424142 has 8 divisors (see below), whose sum is σ = 31573724832. Its totient is φ = 10475849200.

The previous prime is 21000424141. The next prime is 21000424157. The reversal of 21000424142 is 24142400012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000424141) 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, 12180359 + ... + 12182082.

It is an arithmetic number, because the mean of its divisors is an integer number (3946715604).

Almost surely, 2^21000424142 is an apocalyptic number.

21000424142 is a deficient number, since it is larger than the sum of its proper divisors (10573300690).

21000424142 is a wasteful number, since it uses less digits than its factorization.

21000424142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24362874.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21000424142 its reverse (24142400012), we get a palindrome (45142824154).

The spelling of 21000424142 in words is "twenty-one billion, four hundred twenty-four thousand, one hundred forty-two".