21350263 has 8 divisors (see below), whose sum is σ = 23354640. Its totient is φ = 19356480.

The previous prime is 21350213. The next prime is 21350291. The reversal of 21350263 is 36205312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21350263 - 2¹³ = 21342071 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1923 + ... + 6811.

It is an arithmetic number, because the mean of its divisors is an integer number (2919330).

Almost surely, 2^21350263 is an apocalyptic number.

21350263 is a deficient number, since it is larger than the sum of its proper divisors (2004377).

21350263 is a wasteful number, since it uses less digits than its factorization.

21350263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5297.

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

The square root of 21350263 is about 4620.6344802419. The cubic root of 21350263 is about 277.4178551872.

Adding to 21350263 its reverse (36205312), we get a palindrome (57555575).

The spelling of 21350263 in words is "twenty-one million, three hundred fifty thousand, two hundred sixty-three".