21825364 has 24 divisors (see below), whose sum is σ = 43013376. Its totient is φ = 9600000.

The previous prime is 21825361. The next prime is 21825403. The reversal of 21825364 is 46352812.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6637 + ... + 9364.

It is an arithmetic number, because the mean of its divisors is an integer number (1792224).

Almost surely, 2^21825364 is an apocalyptic number.

It is an amenable number.

21825364 is a deficient number, since it is larger than the sum of its proper divisors (21188012).

21825364 is a wasteful number, since it uses less digits than its factorization.

21825364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16047 (or 16045 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21825364 is about 4671.7624083423. The cubic root of 21825364 is about 279.4605429648.

The spelling of 21825364 in words is "twenty-one million, eight hundred twenty-five thousand, three hundred sixty-four".