21030650 has 12 divisors (see below), whose sum is σ = 39117102. Its totient is φ = 8412240.

The previous prime is 21030637. The next prime is 21030677. The reversal of 21030650 is 5603012.

It can be written as a sum of positive squares in 3 ways, for example, as 10962721 + 10067929 = 3311^2 + 3173^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210257 + ... + 210356.

Almost surely, 2^21030650 is an apocalyptic number.

21030650 is a deficient number, since it is larger than the sum of its proper divisors (18086452).

21030650 is a wasteful number, since it uses less digits than its factorization.

21030650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420625 (or 420620 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21030650 is about 4585.9186647824. The cubic root of 21030650 is about 276.0265762408.

Adding to 21030650 its reverse (5603012), we get a palindrome (26633662).

The spelling of 21030650 in words is "twenty-one million, thirty thousand, six hundred fifty".