21530050 has 12 divisors (see below), whose sum is σ = 40045986. Its totient is φ = 8612000.

The previous prime is 21530017. The next prime is 21530077. The reversal of 21530050 is 5003512.

It can be written as a sum of positive squares in 3 ways, for example, as 10712529 + 10817521 = 3273^2 + 3289^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215251 + ... + 215350.

Almost surely, 2^21530050 is an apocalyptic number.

21530050 is a deficient number, since it is larger than the sum of its proper divisors (18515936).

21530050 is a wasteful number, since it uses less digits than its factorization.

21530050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430613 (or 430608 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 21530050 is about 4640.0484911259. The cubic root of 21530050 is about 278.1943760779.

Adding to 21530050 its reverse (5003512), we get a palindrome (26533562).

The spelling of 21530050 in words is "twenty-one million, five hundred thirty thousand, fifty".