21102003321 has 48 divisors (see below), whose sum is σ = 34784847360. Its totient is φ = 11306426880.

The previous prime is 21102003319. The next prime is 21102003331. The reversal of 21102003321 is 12330020112.

It is not a de Polignac number, because 21102003321 - 2¹ = 21102003319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102003321.

It is not an unprimeable number, because it can be changed into a prime (21102003301) 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 47 ways as a sum of consecutive naturals, for example, 656536 + ... + 687926.

It is an arithmetic number, because the mean of its divisors is an integer number (724684320).

Almost surely, 2^21102003321 is an apocalyptic number.

21102003321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21102003321 is a deficient number, since it is larger than the sum of its proper divisors (13682844039).

21102003321 is a wasteful number, since it uses less digits than its factorization.

21102003321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31694 (or 31687 counting only the distinct ones).

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

Adding to 21102003321 its reverse (12330020112), we get a palindrome (33432023433).

The spelling of 21102003321 in words is "twenty-one billion, one hundred two million, three thousand, three hundred twenty-one".