21341504 has 28 divisors (see below), whose sum is σ = 42672000. Its totient is φ = 10589568.

The previous prime is 21341501. The next prime is 21341527. The reversal of 21341504 is 40514312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7697 + ... + 10095.

It is an arithmetic number, because the mean of its divisors is an integer number (1524000).

Almost surely, 2^21341504 is an apocalyptic number.

It is an amenable number.

21341504 is a deficient number, since it is larger than the sum of its proper divisors (21330496).

21341504 is a wasteful number, since it uses less digits than its factorization.

21341504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550 (or 2540 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21341504 is about 4619.6865694547. The cubic root of 21341504 is about 277.3799128699.

Adding to 21341504 its reverse (40514312), we get a palindrome (61855816).

The spelling of 21341504 in words is "twenty-one million, three hundred forty-one thousand, five hundred four".