21669304 has 8 divisors (see below), whose sum is σ = 40629960. Its totient is φ = 10834648.

The previous prime is 21669299. The next prime is 21669313. The reversal of 21669304 is 40396612.

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, 1354324 + ... + 1354339.

It is an arithmetic number, because the mean of its divisors is an integer number (5078745).

Almost surely, 2^21669304 is an apocalyptic number.

It is an amenable number.

21669304 is a deficient number, since it is larger than the sum of its proper divisors (18960656).

21669304 is a wasteful number, since it uses less digits than its factorization.

21669304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708669 (or 2708665 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 21669304 is about 4655.0299676801. The cubic root of 21669304 is about 278.7928645029.

The spelling of 21669304 in words is "twenty-one million, six hundred sixty-nine thousand, three hundred four".