21346503 has 4 divisors (see below), whose sum is σ = 28462008. Its totient is φ = 14231000.

The previous prime is 21346489. The next prime is 21346513. The reversal of 21346503 is 30564312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21346503 - 2¹² = 21342407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346513) 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, 3557748 + ... + 3557753.

It is an arithmetic number, because the mean of its divisors is an integer number (7115502).

Almost surely, 2^21346503 is an apocalyptic number.

21346503 is a deficient number, since it is larger than the sum of its proper divisors (7115505).

21346503 is an equidigital number, since it uses as much as digits as its factorization.

21346503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7115504.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21346503 is about 4620.2275917968. The cubic root of 21346503 is about 277.4015688559.

The spelling of 21346503 in words is "twenty-one million, three hundred forty-six thousand, five hundred three".