21074685 has 8 divisors (see below), whose sum is σ = 33719520. Its totient is φ = 11239824.

The previous prime is 21074681. The next prime is 21074689. The reversal of 21074685 is 58647012.

It is an interprime number because it is at equal distance from previous prime (21074681) and next prime (21074689).

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

It is not a de Polignac number, because 21074685 - 2² = 21074681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21074681) 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 7 ways as a sum of consecutive naturals, for example, 702475 + ... + 702504.

It is an arithmetic number, because the mean of its divisors is an integer number (4214940).

Almost surely, 2^21074685 is an apocalyptic number.

It is an amenable number.

21074685 is a deficient number, since it is larger than the sum of its proper divisors (12644835).

21074685 is a wasteful number, since it uses less digits than its factorization.

21074685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404987.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21074685 is about 4590.7172642192. The cubic root of 21074685 is about 276.2190945682.

The spelling of 21074685 in words is "twenty-one million, seventy-four thousand, six hundred eighty-five".