21946385 has 8 divisors (see below), whose sum is σ = 26385216. Its totient is φ = 17524080.

The previous prime is 21946373. The next prime is 21946403. The reversal of 21946385 is 58364912.

It is a happy number.

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

It is not a de Polignac number, because 21946385 - 2⁴ = 21946369 is a prime.

It is a Duffinian number.

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, 989 + ... + 6698.

It is an arithmetic number, because the mean of its divisors is an integer number (3298152).

Almost surely, 2^21946385 is an apocalyptic number.

It is an amenable number.

21946385 is a deficient number, since it is larger than the sum of its proper divisors (4438831).

21946385 is an equidigital number, since it uses as much as digits as its factorization.

21946385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263.

The product of its digits is 51840, while the sum is 38.

The square root of 21946385 is about 4684.6968952110. The cubic root of 21946385 is about 279.9761246649.

The spelling of 21946385 in words is "twenty-one million, nine hundred forty-six thousand, three hundred eighty-five".