21304107 has 24 divisors (see below), whose sum is σ = 34697040. Its totient is φ = 12909600.

The previous prime is 21304097. The next prime is 21304109. The reversal of 21304107 is 70140312.

It is not a de Polignac number, because 21304107 - 2⁷ = 21303979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21304107.

It is not an unprimeable number, because it can be changed into a prime (21304109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (1445710).

Almost surely, 2^21304107 is an apocalyptic number.

21304107 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21304107 is a deficient number, since it is larger than the sum of its proper divisors (13392933).

21304107 is a wasteful number, since it uses less digits than its factorization.

21304107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6552 (or 6535 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21304107 is about 4615.6372257793. The cubic root of 21304107 is about 277.2177993106.

Adding to 21304107 its reverse (70140312), we get a palindrome (91444419).

The spelling of 21304107 in words is "twenty-one million, three hundred four thousand, one hundred seven".