21344530 has 16 divisors (see below), whose sum is σ = 38491200. Its totient is φ = 8522032.

The previous prime is 21344513. The next prime is 21344593. The reversal of 21344530 is 3544312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4821 + ... + 8119.

It is an arithmetic number, because the mean of its divisors is an integer number (2405700).

Almost surely, 2^21344530 is an apocalyptic number.

21344530 is a deficient number, since it is larger than the sum of its proper divisors (17146670).

21344530 is a wasteful number, since it uses less digits than its factorization.

21344530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3953.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21344530 is about 4620.0140692426. The cubic root of 21344530 is about 277.3930220983.

Adding to 21344530 its reverse (3544312), we get a palindrome (24888842).

The spelling of 21344530 in words is "twenty-one million, three hundred forty-four thousand, five hundred thirty".