21074385 has 8 divisors (see below), whose sum is σ = 33719040. Its totient is φ = 11239664.

The previous prime is 21074359. The next prime is 21074393. The reversal of 21074385 is 58347012.

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 21074385 - 2⁵ = 21074353 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702465 + ... + 702494.

It is an arithmetic number, because the mean of its divisors is an integer number (4214880).

Almost surely, 2^21074385 is an apocalyptic number.

It is an amenable number.

21074385 is a deficient number, since it is larger than the sum of its proper divisors (12644655).

21074385 is a wasteful number, since it uses less digits than its factorization.

21074385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404967.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21074385 is about 4590.6845894703. The cubic root of 21074385 is about 276.2177838942.

The spelling of 21074385 in words is "twenty-one million, seventy-four thousand, three hundred eighty-five".