21517364 has 24 divisors (see below), whose sum is σ = 41858208. Its totient is φ = 9595040.

The previous prime is 21517337. The next prime is 21517369. The reversal of 21517364 is 46371512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21517369) 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, 2282 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (1744092).

Almost surely, 2^21517364 is an apocalyptic number.

It is an amenable number.

21517364 is a deficient number, since it is larger than the sum of its proper divisors (20340844).

21517364 is a wasteful number, since it uses less digits than its factorization.

21517364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9295 (or 9293 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 21517364 is about 4638.6812781220. The cubic root of 21517364 is about 278.1397258373.

Adding to 21517364 its reverse (46371512), we get a palindrome (67888876).

The spelling of 21517364 in words is "twenty-one million, five hundred seventeen thousand, three hundred sixty-four".