21344210 has 16 divisors (see below), whose sum is σ = 38472192. Its totient is φ = 8526000.

The previous prime is 21344209. The next prime is 21344237. The reversal of 21344210 is 1244312.

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, 13775 + ... + 15245.

It is an arithmetic number, because the mean of its divisors is an integer number (2404512).

Almost surely, 2^21344210 is an apocalyptic number.

21344210 is a deficient number, since it is larger than the sum of its proper divisors (17127982).

21344210 is a wasteful number, since it uses less digits than its factorization.

21344210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21344210 is about 4619.9794371837. The cubic root of 21344210 is about 277.3916358538.

Adding to 21344210 its reverse (1244312), we get a palindrome (22588522).

The spelling of 21344210 in words is "twenty-one million, three hundred forty-four thousand, two hundred ten".