21340330 has 16 divisors (see below), whose sum is σ = 41904864. Its totient is φ = 7760080.

The previous prime is 21340327. The next prime is 21340337. The reversal of 21340330 is 3304312.

It is not an unprimeable number, because it can be changed into a prime (21340337) 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, 96892 + ... + 97111.

It is an arithmetic number, because the mean of its divisors is an integer number (2619054).

Almost surely, 2^21340330 is an apocalyptic number.

21340330 is a deficient number, since it is larger than the sum of its proper divisors (20564534).

21340330 is a wasteful number, since it uses less digits than its factorization.

21340330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194021.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21340330 is about 4619.5595028098. The cubic root of 21340330 is about 277.3748265369.

Adding to 21340330 its reverse (3304312), we get a palindrome (24644642).

The spelling of 21340330 in words is "twenty-one million, three hundred forty thousand, three hundred thirty".