21102003231 has 8 divisors (see below), whose sum is σ = 29616846720. Its totient is φ = 13327580952.

The previous prime is 21102003217. The next prime is 21102003233. The reversal of 21102003231 is 13230020112.

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

It is not a de Polignac number, because 21102003231 - 2⁵ = 21102003199 is a prime.

It is a super-2 number, since 2×21102003231² (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 21102003231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102003233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185105235 + ... + 185105348.

It is an arithmetic number, because the mean of its divisors is an integer number (3702105840).

Almost surely, 2^21102003231 is an apocalyptic number.

21102003231 is a deficient number, since it is larger than the sum of its proper divisors (8514843489).

21102003231 is a wasteful number, since it uses less digits than its factorization.

21102003231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370210605.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21102003231 its reverse (13230020112), we get a palindrome (34332023343).

The spelling of 21102003231 in words is "twenty-one billion, one hundred two million, three thousand, two hundred thirty-one".