21321274 has 16 divisors (see below), whose sum is σ = 34602120. Its totient is φ = 9794880.

The previous prime is 21321263. The next prime is 21321277. The reversal of 21321274 is 47212312.

It can be written as a sum of positive squares in 4 ways, for example, as 21095649 + 225625 = 4593^2 + 475^2 .

It is not an unprimeable number, because it can be changed into a prime (21321277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4164 + ... + 7744.

Almost surely, 2^21321274 is an apocalyptic number.

21321274 is a deficient number, since it is larger than the sum of its proper divisors (13280846).

21321274 is a wasteful number, since it uses less digits than its factorization.

21321274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825.

The product of its digits is 672, while the sum is 22.

The square root of 21321274 is about 4617.4965078492. The cubic root of 21321274 is about 277.2922406731.

Adding to 21321274 its reverse (47212312), we get a palindrome (68533586).

The spelling of 21321274 in words is "twenty-one million, three hundred twenty-one thousand, two hundred seventy-four".