21852545 has 24 divisors (see below), whose sum is σ = 30989952. Its totient is φ = 14664000.

The previous prime is 21852539. The next prime is 21852547. The reversal of 21852545 is 54525812.

It is not a de Polignac number, because 21852545 - 2⁴ = 21852529 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8120 + ... + 10470.

It is an arithmetic number, because the mean of its divisors is an integer number (1291248).

Almost surely, 2^21852545 is an apocalyptic number.

It is an amenable number.

21852545 is a deficient number, since it is larger than the sum of its proper divisors (9137407).

21852545 is a wasteful number, since it uses less digits than its factorization.

21852545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393 (or 2380 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

The square root of 21852545 is about 4674.6705766289. The cubic root of 21852545 is about 279.5765069089.

The spelling of 21852545 in words is "twenty-one million, eight hundred fifty-two thousand, five hundred forty-five".