21180364 has 12 divisors (see below), whose sum is σ = 39016600. Its totient is φ = 10032768.

The previous prime is 21180343. The next prime is 21180373. The reversal of 21180364 is 46308112.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 139269 + ... + 139420.

Almost surely, 2^21180364 is an apocalyptic number.

It is an amenable number.

21180364 is a deficient number, since it is larger than the sum of its proper divisors (17836236).

21180364 is a wasteful number, since it uses less digits than its factorization.

21180364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278712 (or 278710 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21180364 is about 4602.2129459641. The cubic root of 21180364 is about 276.6800251610.

Adding to 21180364 its reverse (46308112), we get a palindrome (67488476).

The spelling of 21180364 in words is "twenty-one million, one hundred eighty thousand, three hundred sixty-four".