21102353 has 4 divisors (see below), whose sum is σ = 21460080. Its totient is φ = 20744628.

The previous prime is 21102313. The next prime is 21102377. The reversal of 21102353 is 35320112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21102353 - 2¹² = 21098257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102313) 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 3 ways as a sum of consecutive naturals, for example, 178775 + ... + 178892.

It is an arithmetic number, because the mean of its divisors is an integer number (5365020).

Almost surely, 2^21102353 is an apocalyptic number.

It is an amenable number.

21102353 is a deficient number, since it is larger than the sum of its proper divisors (357727).

21102353 is an equidigital number, since it uses as much as digits as its factorization.

21102353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357726.

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

The square root of 21102353 is about 4593.7297482547. The cubic root of 21102353 is about 276.3399202235.

Adding to 21102353 its reverse (35320112), we get a palindrome (56422465).

The spelling of 21102353 in words is "twenty-one million, one hundred two thousand, three hundred fifty-three".