21042230503 has 8 divisors (see below), whose sum is σ = 24139703808. Its totient is φ = 17967617304.

The previous prime is 21042230483. The next prime is 21042230507. The reversal of 21042230503 is 30503224012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21042230503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042230507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5713051 + ... + 5716732.

It is an arithmetic number, because the mean of its divisors is an integer number (3017462976).

Almost surely, 2^21042230503 is an apocalyptic number.

21042230503 is a deficient number, since it is larger than the sum of its proper divisors (3097473305).

21042230503 is a wasteful number, since it uses less digits than its factorization.

21042230503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11430053.

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 21042230503 its reverse (30503224012), we get a palindrome (51545454515).

The spelling of 21042230503 in words is "twenty-one billion, forty-two million, two hundred thirty thousand, five hundred three".