21124231003 has 4 divisors (see below), whose sum is σ = 21231460800. Its totient is φ = 21017001208.

The previous prime is 21124231001. The next prime is 21124231019. The reversal of 21124231003 is 30013242112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21124231003 - 2¹ = 21124231001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124231001) 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, 53614603 + ... + 53614996.

It is an arithmetic number, because the mean of its divisors is an integer number (5307865200).

Almost surely, 2^21124231003 is an apocalyptic number.

21124231003 is a deficient number, since it is larger than the sum of its proper divisors (107229797).

21124231003 is a wasteful number, since it uses less digits than its factorization.

21124231003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107229796.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21124231003 its reverse (30013242112), we get a palindrome (51137473115).

The spelling of 21124231003 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-one thousand, three".