21363604 has 24 divisors (see below), whose sum is σ = 39584160. Its totient is φ = 10071264.

The previous prime is 21363599. The next prime is 21363607. The reversal of 21363604 is 40636312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2847 + ... + 7129.

It is an arithmetic number, because the mean of its divisors is an integer number (1649340).

Almost surely, 2^21363604 is an apocalyptic number.

It is an amenable number.

21363604 is a deficient number, since it is larger than the sum of its proper divisors (18220556).

21363604 is a wasteful number, since it uses less digits than its factorization.

21363604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359 (or 4357 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 21363604 is about 4622.0778877038. The cubic root of 21363604 is about 277.4756259197.

Adding to 21363604 its reverse (40636312), we get a palindrome (61999916).

The spelling of 21363604 in words is "twenty-one million, three hundred sixty-three thousand, six hundred four".