21304412 has 12 divisors (see below), whose sum is σ = 37392600. Its totient is φ = 10620816.

The previous prime is 21304397. The next prime is 21304427. The reversal of 21304412 is 21440312.

It is an interprime number because it is at equal distance from previous prime (21304397) and next prime (21304427).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6287 + ... + 9062.

It is an arithmetic number, because the mean of its divisors is an integer number (3116050).

Almost surely, 2^21304412 is an apocalyptic number.

It is an amenable number.

21304412 is a deficient number, since it is larger than the sum of its proper divisors (16088188).

21304412 is a wasteful number, since it uses less digits than its factorization.

21304412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15700 (or 15698 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21304412 is about 4615.6702655194. The cubic root of 21304412 is about 277.2191222327.

Adding to 21304412 its reverse (21440312), we get a palindrome (42744724).

The spelling of 21304412 in words is "twenty-one million, three hundred four thousand, four hundred twelve".