21214264 has 8 divisors (see below), whose sum is σ = 39776760. Its totient is φ = 10607128.

The previous prime is 21214253. The next prime is 21214267. The reversal of 21214264 is 46241212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214267) by changing a digit.

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 as a sum of consecutive naturals, namely, 1325884 + ... + 1325899.

It is an arithmetic number, because the mean of its divisors is an integer number (4972095).

Almost surely, 2^21214264 is an apocalyptic number.

It is an amenable number.

21214264 is a deficient number, since it is larger than the sum of its proper divisors (18562496).

21214264 is a wasteful number, since it uses less digits than its factorization.

21214264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651789 (or 2651785 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 21214264 is about 4605.8944842452. The cubic root of 21214264 is about 276.8275588741.

Adding to 21214264 its reverse (46241212), we get a palindrome (67455476).

The spelling of 21214264 in words is "twenty-one million, two hundred fourteen thousand, two hundred sixty-four".