21003004142 has 8 divisors (see below), whose sum is σ = 31542058800. Its totient is φ = 10488984544.

The previous prime is 21003004129. The next prime is 21003004159. The reversal of 21003004142 is 24140030012.

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

It is a super-2 number, since 2×21003004142² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003004142.

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, 6256667 + ... + 6260022.

It is an arithmetic number, because the mean of its divisors is an integer number (3942757350).

Almost surely, 2^21003004142 is an apocalyptic number.

21003004142 is a deficient number, since it is larger than the sum of its proper divisors (10539054658).

21003004142 is a wasteful number, since it uses less digits than its factorization.

21003004142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12517530.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21003004142 its reverse (24140030012), we get a palindrome (45143034154).

The spelling of 21003004142 in words is "twenty-one billion, three million, four thousand, one hundred forty-two".