21270324 has 24 divisors (see below), whose sum is σ = 50115520. Its totient is φ = 7020864.

The previous prime is 21270323. The next prime is 21270373. The reversal of 21270324 is 42307212.

It is a self number, because there is not a number n which added to its sum of digits gives 21270324.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270323) 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 in 7 ways as a sum of consecutive naturals, for example, 7369 + ... + 9840.

Almost surely, 2^21270324 is an apocalyptic number.

It is an amenable number.

21270324 is an abundant number, since it is smaller than the sum of its proper divisors (28845196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21270324 is a wasteful number, since it uses less digits than its factorization.

21270324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17319 (or 17317 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21270324 is about 4611.9761491144. The cubic root of 21270324 is about 277.0711890256.

Adding to 21270324 its reverse (42307212), we get a palindrome (63577536).

The spelling of 21270324 in words is "twenty-one million, two hundred seventy thousand, three hundred twenty-four".