21163330 has 16 divisors (see below), whose sum is σ = 39408120. Its totient is φ = 8173312.

The previous prime is 21163313. The next prime is 21163333. The reversal of 21163330 is 3336112.

It can be written as a sum of positive squares in 4 ways, for example, as 13373649 + 7789681 = 3657^2 + 2791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21163298 and 21163307.

It is not an unprimeable number, because it can be changed into a prime (21163333) 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, 36199 + ... + 36778.

Almost surely, 2^21163330 is an apocalyptic number.

21163330 is a deficient number, since it is larger than the sum of its proper divisors (18244790).

21163330 is a wasteful number, since it uses less digits than its factorization.

21163330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73013.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21163330 is about 4600.3619422824. The cubic root of 21163330 is about 276.6058333049.

Adding to 21163330 its reverse (3336112), we get a palindrome (24499442).

The spelling of 21163330 in words is "twenty-one million, one hundred sixty-three thousand, three hundred thirty".