21494685 has 8 divisors (see below), whose sum is σ = 34391520. Its totient is φ = 11463824.

The previous prime is 21494677. The next prime is 21494689. The reversal of 21494685 is 58649412.

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

It is a cyclic number.

It is not a de Polignac number, because 21494685 - 2³ = 21494677 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716475 + ... + 716504.

It is an arithmetic number, because the mean of its divisors is an integer number (4298940).

Almost surely, 2^21494685 is an apocalyptic number.

It is an amenable number.

21494685 is a deficient number, since it is larger than the sum of its proper divisors (12896835).

21494685 is a wasteful number, since it uses less digits than its factorization.

21494685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432987.

The product of its digits is 69120, while the sum is 39.

The square root of 21494685 is about 4636.2360811331. The cubic root of 21494685 is about 278.0419730287.

The spelling of 21494685 in words is "twenty-one million, four hundred ninety-four thousand, six hundred eighty-five".