21855202 has 16 divisors (see below), whose sum is σ = 33480000. Its totient is φ = 10697040.

The previous prime is 21855191. The next prime is 21855209. The reversal of 21855202 is 20255812.

It is not an unprimeable number, because it can be changed into a prime (21855209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43549 + ... + 44047.

It is an arithmetic number, because the mean of its divisors is an integer number (2092500).

Almost surely, 2^21855202 is an apocalyptic number.

21855202 is a deficient number, since it is larger than the sum of its proper divisors (11624798).

21855202 is a wasteful number, since it uses less digits than its factorization.

21855202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 21855202 is about 4674.9547591394. The cubic root of 21855202 is about 279.5878374683.

The spelling of 21855202 in words is "twenty-one million, eight hundred fifty-five thousand, two hundred two".