21004485 has 8 divisors (see below), whose sum is σ = 33607200. Its totient is φ = 11202384.

The previous prime is 21004471. The next prime is 21004499. The reversal of 21004485 is 58440012.

It is an interprime number because it is at equal distance from previous prime (21004471) and next prime (21004499).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21004485 - 2¹³ = 20996293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 700135 + ... + 700164.

It is an arithmetic number, because the mean of its divisors is an integer number (4200900).

Almost surely, 2^21004485 is an apocalyptic number.

It is an amenable number.

21004485 is a deficient number, since it is larger than the sum of its proper divisors (12602715).

21004485 is a wasteful number, since it uses less digits than its factorization.

21004485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400307.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21004485 is about 4583.0650224495. The cubic root of 21004485 is about 275.9120571526.

Adding to 21004485 its reverse (58440012), we get a palindrome (79444497).

The spelling of 21004485 in words is "twenty-one million, four thousand, four hundred eighty-five".