21073330 has 16 divisors (see below), whose sum is σ = 38648664. Its totient is φ = 8270080.

The previous prime is 21073321. The next prime is 21073363. The reversal of 21073330 is 3337012.

It can be written as a sum of positive squares in 4 ways, for example, as 14432401 + 6640929 = 3799^2 + 2577^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21073298 and 21073307.

It is an unprimeable number.

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, 19351 + ... + 20410.

Almost surely, 2^21073330 is an apocalyptic number.

21073330 is a deficient number, since it is larger than the sum of its proper divisors (17575334).

21073330 is a wasteful number, since it uses less digits than its factorization.

21073330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39821.

The product of its (nonzero) digits is 378, while the sum is 19.

The square root of 21073330 is about 4590.5696814230. The cubic root of 21073330 is about 276.2131745920.

The spelling of 21073330 in words is "twenty-one million, seventy-three thousand, three hundred thirty".