21607384 has 16 divisors (see below), whose sum is σ = 40788000. Its totient is φ = 10730592.

The previous prime is 21607381. The next prime is 21607387. The reversal of 21607384 is 48370612.

It is an interprime number because it is at equal distance from previous prime (21607381) and next prime (21607387).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607381) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 7872 + ... + 10255.

It is an arithmetic number, because the mean of its divisors is an integer number (2549250).

Almost surely, 2^21607384 is an apocalyptic number.

It is an amenable number.

21607384 is a deficient number, since it is larger than the sum of its proper divisors (19180616).

21607384 is a wasteful number, since it uses less digits than its factorization.

21607384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18282 (or 18278 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21607384 is about 4648.3743394869. The cubic root of 21607384 is about 278.5270611160.

Adding to 21607384 its reverse (48370612), we get a palindrome (69977996).

The spelling of 21607384 in words is "twenty-one million, six hundred seven thousand, three hundred eighty-four".