21103113321 has 48 divisors (see below), whose sum is σ = 32280568320. Its totient is φ = 13263264000.

The previous prime is 21103113299. The next prime is 21103113329. The reversal of 21103113321 is 12331130112.

21103113321 is a `hidden beast` number, since 21 + 1 + 0 + 311 + 332 + 1 = 666.

It is not a de Polignac number, because 21103113321 - 2⁵ = 21103113289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21103113294 and 21103113303.

It is not an unprimeable number, because it can be changed into a prime (21103113329) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14767035 + ... + 14768463.

It is an arithmetic number, because the mean of its divisors is an integer number (672511840).

Almost surely, 2^21103113321 is an apocalyptic number.

It is an amenable number.

21103113321 is a deficient number, since it is larger than the sum of its proper divisors (11177454999).

21103113321 is a wasteful number, since it uses less digits than its factorization.

21103113321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798 (or 2795 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21103113321 its reverse (12331130112), we get a palindrome (33434243433).

The spelling of 21103113321 in words is "twenty-one billion, one hundred three million, one hundred thirteen thousand, three hundred twenty-one".