21485503 has 4 divisors (see below), whose sum is σ = 23138248. Its totient is φ = 19832760.

The previous prime is 21485489. The next prime is 21485507. The reversal of 21485503 is 30558412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21485503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826353 + ... + 826378.

It is an arithmetic number, because the mean of its divisors is an integer number (5784562).

Almost surely, 2^21485503 is an apocalyptic number.

21485503 is a deficient number, since it is larger than the sum of its proper divisors (1652745).

21485503 is a wasteful number, since it uses less digits than its factorization.

21485503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652744.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 21485503 is about 4635.2457324289. The cubic root of 21485503 is about 278.0023764957.

The spelling of 21485503 in words is "twenty-one million, four hundred eighty-five thousand, five hundred three".