21850845 has 16 divisors (see below), whose sum is σ = 35309952. Its totient is φ = 11537600.

The previous prime is 21850819. The next prime is 21850849. The reversal of 21850845 is 54805812.

It is not a de Polignac number, because 21850845 - 2⁹ = 21850333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5697 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (2206872).

Almost surely, 2^21850845 is an apocalyptic number.

It is an amenable number.

21850845 is a deficient number, since it is larger than the sum of its proper divisors (13459107).

21850845 is a wasteful number, since it uses less digits than its factorization.

21850845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14532.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 21850845 is about 4674.4887420979. The cubic root of 21850845 is about 279.5692569160.

The spelling of 21850845 in words is "twenty-one million, eight hundred fifty thousand, eight hundred forty-five".