21364503 has 16 divisors (see below), whose sum is σ = 30269280. Its totient is φ = 13378176.

The previous prime is 21364501. The next prime is 21364513. The reversal of 21364503 is 30546312.

It is a happy number.

It is not a de Polignac number, because 21364503 - 2¹ = 21364501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (1891830).

Almost surely, 2^21364503 is an apocalyptic number.

21364503 is a deficient number, since it is larger than the sum of its proper divisors (8904777).

21364503 is a wasteful number, since it uses less digits than its factorization.

21364503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6706.

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

The square root of 21364503 is about 4622.1751373136. The cubic root of 21364503 is about 277.4795180078.

The spelling of 21364503 in words is "twenty-one million, three hundred sixty-four thousand, five hundred three".