21124242003 has 4 divisors (see below), whose sum is σ = 28165656008. Its totient is φ = 14082828000.

The previous prime is 21124241993. The next prime is 21124242023. The reversal of 21124242003 is 30024242112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21124242003 - 2⁹ = 21124241491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124242023) 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, 3520706998 + ... + 3520707003.

It is an arithmetic number, because the mean of its divisors is an integer number (7041414002).

Almost surely, 2^21124242003 is an apocalyptic number.

21124242003 is a deficient number, since it is larger than the sum of its proper divisors (7041414005).

21124242003 is an equidigital number, since it uses as much as digits as its factorization.

21124242003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041414004.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21124242003 its reverse (30024242112), we get a palindrome (51148484115).

The spelling of 21124242003 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty-two thousand, three".