21003050 has 24 divisors (see below), whose sum is σ = 40125036. Its totient is φ = 8173440.

The previous prime is 21003011. The next prime is 21003053. The reversal of 21003050 is 5030012.

It can be written as a sum of positive squares in 6 ways, for example, as 9840769 + 11162281 = 3137^2 + 3341^2 .

It is a super-2 number, since 2×21003050² = 882256218605000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003053) 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 11 ways as a sum of consecutive naturals, for example, 3827 + ... + 7526.

Almost surely, 2^21003050 is an apocalyptic number.

21003050 is a deficient number, since it is larger than the sum of its proper divisors (19121986).

21003050 is a wasteful number, since it uses less digits than its factorization.

21003050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11402 (or 11397 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 21003050 is about 4582.9084651562. The cubic root of 21003050 is about 275.9057736879.

Adding to 21003050 its reverse (5030012), we get a palindrome (26033062).

The spelling of 21003050 in words is "twenty-one million, three thousand, fifty".