21304594 has 8 divisors (see below), whose sum is σ = 31987260. Its totient is φ = 10642176.

The previous prime is 21304579. The next prime is 21304597. The reversal of 21304594 is 49540312.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 1723969 = 4425^2 + 1313^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21304597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2079 + ... + 6850.

Almost surely, 2^21304594 is an apocalyptic number.

21304594 is a deficient number, since it is larger than the sum of its proper divisors (10682666).

21304594 is a wasteful number, since it uses less digits than its factorization.

21304594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10124.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21304594 is about 4615.6899809238. The cubic root of 21304594 is about 277.2199116426.

It can be divided in two parts, 2130 and 4594, that added together give a square (6724 = 82²).

The spelling of 21304594 in words is "twenty-one million, three hundred four thousand, five hundred ninety-four".