21242050 has 12 divisors (see below), whose sum is σ = 39510306. Its totient is φ = 8496800.

The previous prime is 21242047. The next prime is 21242063. The reversal of 21242050 is 5024212.

It can be written as a sum of positive squares in 3 ways, for example, as 15864289 + 5377761 = 3983^2 + 2319^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212371 + ... + 212470.

Almost surely, 2^21242050 is an apocalyptic number.

21242050 is a deficient number, since it is larger than the sum of its proper divisors (18268256).

21242050 is a wasteful number, since it uses less digits than its factorization.

21242050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424853 (or 424848 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21242050 is about 4608.9098494112. The cubic root of 21242050 is about 276.9483671308.

Adding to 21242050 its reverse (5024212), we get a palindrome (26266262).

The spelling of 21242050 in words is "twenty-one million, two hundred forty-two thousand, fifty".