21024250 has 32 divisors (see below), whose sum is σ = 42391440. Its totient is φ = 7761600.

The previous prime is 21024221. The next prime is 21024253. The reversal of 21024250 is 5242012.

It can be written as a sum of positive squares in 8 ways, for example, as 1760929 + 19263321 = 1327^2 + 4389^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024253) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16 + ... + 6484.

Almost surely, 2^21024250 is an apocalyptic number.

21024250 is an abundant number, since it is smaller than the sum of its proper divisors (21367190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21024250 is a wasteful number, since it uses less digits than its factorization.

21024250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6499 (or 6489 counting only the distinct ones).

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

The square root of 21024250 is about 4585.2208234719. The cubic root of 21024250 is about 275.9985734716.

Adding to 21024250 its reverse (5242012), we get a palindrome (26266262).

The spelling of 21024250 in words is "twenty-one million, twenty-four thousand, two hundred fifty".