21307376 has 10 divisors (see below), whose sum is σ = 41283072. Its totient is φ = 10653680.

The previous prime is 21307369. The next prime is 21307381. The reversal of 21307376 is 67370312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665840 + ... + 665871.

Almost surely, 2^21307376 is an apocalyptic number.

It is an amenable number.

21307376 is a deficient number, since it is larger than the sum of its proper divisors (19975696).

21307376 is a wasteful number, since it uses less digits than its factorization.

21307376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331719 (or 1331713 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 21307376 is about 4615.9913344806. The cubic root of 21307376 is about 277.2319777761.

Adding to 21307376 its reverse (67370312), we get a palindrome (88677688).

The spelling of 21307376 in words is "twenty-one million, three hundred seven thousand, three hundred seventy-six".