21027250 has 32 divisors (see below), whose sum is σ = 39639600. Its totient is φ = 8352000.

The previous prime is 21027239. The next prime is 21027257. The reversal of 21027250 is 5272012.

It can be written as a sum of positive squares in 8 ways, for example, as 3713329 + 17313921 = 1927^2 + 4161^2 .

It is not an unprimeable number, because it can be changed into a prime (21027257) 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 15 ways as a sum of consecutive naturals, for example, 60076 + ... + 60424.

Almost surely, 2^21027250 is an apocalyptic number.

21027250 is a deficient number, since it is larger than the sum of its proper divisors (18612350).

21027250 is a wasteful number, since it uses less digits than its factorization.

21027250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21027250 is about 4585.5479498093. The cubic root of 21027250 is about 276.0117004772.

Adding to 21027250 its reverse (5272012), we get a palindrome (26299262).

The spelling of 21027250 in words is "twenty-one million, twenty-seven thousand, two hundred fifty".