21363250 has 16 divisors (see below), whose sum is σ = 39992472. Its totient is φ = 8545200.

The previous prime is 21363193. The next prime is 21363253. The reversal of 21363250 is 5236312.

It can be written as a sum of positive squares in 4 ways, for example, as 8838729 + 12524521 = 2973^2 + 3539^2 .

It is not an unprimeable number, because it can be changed into a prime (21363253) 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 7 ways as a sum of consecutive naturals, for example, 42477 + ... + 42976.

Almost surely, 2^21363250 is an apocalyptic number.

21363250 is a deficient number, since it is larger than the sum of its proper divisors (18629222).

21363250 is an equidigital number, since it uses as much as digits as its factorization.

21363250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85470 (or 85460 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21363250 is about 4622.0395930801. The cubic root of 21363250 is about 277.4740932988.

Adding to 21363250 its reverse (5236312), we get a palindrome (26599562).

The spelling of 21363250 in words is "twenty-one million, three hundred sixty-three thousand, two hundred fifty".