21365103 has 4 divisors (see below), whose sum is σ = 28486808. Its totient is φ = 14243400.

The previous prime is 21365093. The next prime is 21365117. The reversal of 21365103 is 30156312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21365103 - 2⁴ = 21365087 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 21365103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365143) 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 3 ways as a sum of consecutive naturals, for example, 3560848 + ... + 3560853.

It is an arithmetic number, because the mean of its divisors is an integer number (7121702).

Almost surely, 2^21365103 is an apocalyptic number.

21365103 is a deficient number, since it is larger than the sum of its proper divisors (7121705).

21365103 is an equidigital number, since it uses as much as digits as its factorization.

21365103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7121704.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21365103 is about 4622.2400413652. The cubic root of 21365103 is about 277.4821155587.

The spelling of 21365103 in words is "twenty-one million, three hundred sixty-five thousand, one hundred three".