21160364 has 12 divisors (see below), whose sum is σ = 37538424. Its totient is φ = 10435104.

The previous prime is 21160339. The next prime is 21160379. The reversal of 21160364 is 46306112.

It is a happy number.

It is a super-2 number, since 2×21160364² = 895522009224992, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 35942 + ... + 36525.

It is an arithmetic number, because the mean of its divisors is an integer number (3128202).

Almost surely, 2^21160364 is an apocalyptic number.

It is an amenable number.

21160364 is a deficient number, since it is larger than the sum of its proper divisors (16378060).

21160364 is a wasteful number, since it uses less digits than its factorization.

21160364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72544 (or 72542 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21160364 is about 4600.0395650472. The cubic root of 21160364 is about 276.5929107760.

Adding to 21160364 its reverse (46306112), we get a palindrome (67466476).

The spelling of 21160364 in words is "twenty-one million, one hundred sixty thousand, three hundred sixty-four".