21425336 has 8 divisors (see below), whose sum is σ = 40172520. Its totient is φ = 10712664.

The previous prime is 21425333. The next prime is 21425347. The reversal of 21425336 is 63352412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425333) 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 as a sum of consecutive naturals, namely, 1339076 + ... + 1339091.

It is an arithmetic number, because the mean of its divisors is an integer number (5021565).

Almost surely, 2^21425336 is an apocalyptic number.

It is an amenable number.

21425336 is a deficient number, since it is larger than the sum of its proper divisors (18747184).

21425336 is a wasteful number, since it uses less digits than its factorization.

21425336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678173 (or 2678169 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 21425336 is about 4628.7510194436. The cubic root of 21425336 is about 277.7426322586.

Adding to 21425336 its reverse (63352412), we get a palindrome (84777748).

The spelling of 21425336 in words is "twenty-one million, four hundred twenty-five thousand, three hundred thirty-six".