21271364 has 6 divisors (see below), whose sum is σ = 37224894. Its totient is φ = 10635680.

The previous prime is 21271351. The next prime is 21271379. The reversal of 21271364 is 46317212.

It can be written as a sum of positive squares in only one way, i.e., 21086464 + 184900 = 4592^2 + 430^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2658917 + ... + 2658924.

It is an arithmetic number, because the mean of its divisors is an integer number (6204149).

Almost surely, 2^21271364 is an apocalyptic number.

It is an amenable number.

21271364 is a deficient number, since it is larger than the sum of its proper divisors (15953530).

21271364 is a wasteful number, since it uses less digits than its factorization.

21271364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317845 (or 5317843 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 21271364 is about 4612.0888976688. The cubic root of 21271364 is about 277.0757046963.

Adding to 21271364 its reverse (46317212), we get a palindrome (67588576).

The spelling of 21271364 in words is "twenty-one million, two hundred seventy-one thousand, three hundred sixty-four".