21470276 has 6 divisors (see below), whose sum is σ = 37572990. Its totient is φ = 10735136.

The previous prime is 21470261. The next prime is 21470279. The reversal of 21470276 is 67207412.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 7706176 = 3710^2 + 2776^2 .

It is not an unprimeable number, because it can be changed into a prime (21470279) 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, 2683781 + ... + 2683788.

It is an arithmetic number, because the mean of its divisors is an integer number (6262165).

Almost surely, 2^21470276 is an apocalyptic number.

It is an amenable number.

21470276 is a deficient number, since it is larger than the sum of its proper divisors (16102714).

21470276 is a wasteful number, since it uses less digits than its factorization.

21470276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5367573 (or 5367571 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21470276 is about 4633.6029178168. The cubic root of 21470276 is about 277.9366865806.

Adding to 21470276 its reverse (67207412), we get a palindrome (88677688).

The spelling of 21470276 in words is "twenty-one million, four hundred seventy thousand, two hundred seventy-six".