21023353 has 8 divisors (see below), whose sum is σ = 22678208. Its totient is φ = 19373904.

The previous prime is 21023341. The next prime is 21023381. The reversal of 21023353 is 35332012.

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 21023353 - 2¹³ = 21015161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21023353.

It is not an unprimeable number, because it can be changed into a prime (21023323) 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, 10900 + ... + 12682.

It is an arithmetic number, because the mean of its divisors is an integer number (2834776).

Almost surely, 2^21023353 is an apocalyptic number.

It is an amenable number.

21023353 is a deficient number, since it is larger than the sum of its proper divisors (1654855).

21023353 is a wasteful number, since it uses less digits than its factorization.

21023353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 21023353 is about 4585.1230081646. The cubic root of 21023353 is about 275.9946482544.

Adding to 21023353 its reverse (35332012), we get a palindrome (56355365).

The spelling of 21023353 in words is "twenty-one million, twenty-three thousand, three hundred fifty-three".