21345304 has 8 divisors (see below), whose sum is σ = 40022460. Its totient is φ = 10672648.

The previous prime is 21345287. The next prime is 21345347. The reversal of 21345304 is 40354312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334074 + ... + 1334089.

Almost surely, 2^21345304 is an apocalyptic number.

It is an amenable number.

21345304 is a deficient number, since it is larger than the sum of its proper divisors (18677156).

21345304 is a wasteful number, since it uses less digits than its factorization.

21345304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668169 (or 2668165 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21345304 is about 4620.0978344620. The cubic root of 21345304 is about 277.3963750198.

Adding to 21345304 its reverse (40354312), we get a palindrome (61699616).

The spelling of 21345304 in words is "twenty-one million, three hundred forty-five thousand, three hundred four".