21250363 has 4 divisors (see below), whose sum is σ = 21259728. Its totient is φ = 21241000.

The previous prime is 21250351. The next prime is 21250393. The reversal of 21250363 is 36305212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21250363 - 2⁵ = 21250331 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (5314932).

Almost surely, 2^21250363 is an apocalyptic number.

21250363 is a deficient number, since it is larger than the sum of its proper divisors (9365).

21250363 is an equidigital number, since it uses as much as digits as its factorization.

21250363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9364.

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

The square root of 21250363 is about 4609.8116013564. The cubic root of 21250363 is about 276.9844900020.

Adding to 21250363 its reverse (36305212), we get a palindrome (57555575).

The spelling of 21250363 in words is "twenty-one million, two hundred fifty thousand, three hundred sixty-three".