21852345 has 8 divisors (see below), whose sum is σ = 34963776. Its totient is φ = 11654576.

The previous prime is 21852343. The next prime is 21852353. The reversal of 21852345 is 54325812.

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 21852345 - 2¹ = 21852343 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21852343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728397 + ... + 728426.

It is an arithmetic number, because the mean of its divisors is an integer number (4370472).

Almost surely, 2^21852345 is an apocalyptic number.

It is an amenable number.

21852345 is a deficient number, since it is larger than the sum of its proper divisors (13111431).

21852345 is a wasteful number, since it uses less digits than its factorization.

21852345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456831.

The product of its digits is 9600, while the sum is 30.

The square root of 21852345 is about 4674.6491846982. The cubic root of 21852345 is about 279.5756539881.

Subtracting from 21852345 its product of digits (9600), we obtain a triangular number (21842745 = T₆₆₀₉).

The spelling of 21852345 in words is "twenty-one million, eight hundred fifty-two thousand, three hundred forty-five".