21842385 has 8 divisors (see below), whose sum is σ = 34947840. Its totient is φ = 11649264.

The previous prime is 21842377. The next prime is 21842393. The reversal of 21842385 is 58324812.

It is an interprime number because it is at equal distance from previous prime (21842377) and next prime (21842393).

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

It is not a de Polignac number, because 21842385 - 2³ = 21842377 is a prime.

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, 728065 + ... + 728094.

It is an arithmetic number, because the mean of its divisors is an integer number (4368480).

Almost surely, 2^21842385 is an apocalyptic number.

It is an amenable number.

21842385 is a deficient number, since it is larger than the sum of its proper divisors (13105455).

21842385 is a wasteful number, since it uses less digits than its factorization.

21842385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456167.

The product of its digits is 15360, while the sum is 33.

The square root of 21842385 is about 4673.5837426968. The cubic root of 21842385 is about 279.5331719467.

The spelling of 21842385 in words is "twenty-one million, eight hundred forty-two thousand, three hundred eighty-five".