21446385 has 8 divisors (see below), whose sum is σ = 34314240. Its totient is φ = 11438064.

The previous prime is 21446377. The next prime is 21446387. The reversal of 21446385 is 58364412.

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

It is not a de Polignac number, because 21446385 - 2³ = 21446377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21446387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714865 + ... + 714894.

It is an arithmetic number, because the mean of its divisors is an integer number (4289280).

Almost surely, 2^21446385 is an apocalyptic number.

It is an amenable number.

21446385 is a deficient number, since it is larger than the sum of its proper divisors (12867855).

21446385 is a wasteful number, since it uses less digits than its factorization.

21446385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429767.

The product of its digits is 23040, while the sum is 33.

The square root of 21446385 is about 4631.0241847781. The cubic root of 21446385 is about 277.8335571836.

The spelling of 21446385 in words is "twenty-one million, four hundred forty-six thousand, three hundred eighty-five".