21304130 has 32 divisors (see below), whose sum is σ = 41679360. Its totient is φ = 7810560.

The previous prime is 21304121. The next prime is 21304139. The reversal of 21304130 is 3140312.

It is an interprime number because it is at equal distance from previous prime (21304121) and next prime (21304139).

It is not an unprimeable number, because it can be changed into a prime (21304139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4082 + ... + 7698.

It is an arithmetic number, because the mean of its divisors is an integer number (1302480).

Almost surely, 2^21304130 is an apocalyptic number.

21304130 is a deficient number, since it is larger than the sum of its proper divisors (20375230).

21304130 is a wasteful number, since it uses less digits than its factorization.

21304130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21304130 is about 4615.6397173090. The cubic root of 21304130 is about 277.2178990724.

Adding to 21304130 its reverse (3140312), we get a palindrome (24444442).

The spelling of 21304130 in words is "twenty-one million, three hundred four thousand, one hundred thirty".