21152303 has 8 divisors (see below), whose sum is σ = 21673920. Its totient is φ = 20633760.

The previous prime is 21152291. The next prime is 21152309. The reversal of 21152303 is 30325112.

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

It is a cyclic number.

It is not a de Polignac number, because 21152303 - 2⁶ = 21152239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152309) 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 7 ways as a sum of consecutive naturals, for example, 19253 + ... + 20321.

It is an arithmetic number, because the mean of its divisors is an integer number (2709240).

Almost surely, 2^21152303 is an apocalyptic number.

21152303 is a deficient number, since it is larger than the sum of its proper divisors (521617).

21152303 is a wasteful number, since it uses less digits than its factorization.

21152303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21152303 is about 4599.1632934698. The cubic root of 21152303 is about 276.5577838025.

Adding to 21152303 its reverse (30325112), we get a palindrome (51477415).

The spelling of 21152303 in words is "twenty-one million, one hundred fifty-two thousand, three hundred three".