21852055 has 16 divisors (see below), whose sum is σ = 28664064. Its totient is φ = 15920640.

The previous prime is 21852037. The next prime is 21852067. The reversal of 21852055 is 55025812.

It is not a de Polignac number, because 21852055 - 2⁷ = 21851927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1512 + ... + 6781.

It is an arithmetic number, because the mean of its divisors is an integer number (1791504).

Almost surely, 2^21852055 is an apocalyptic number.

21852055 is a deficient number, since it is larger than the sum of its proper divisors (6812009).

21852055 is a wasteful number, since it uses less digits than its factorization.

21852055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 21852055 is about 4674.6181662249. The cubic root of 21852055 is about 279.5744172437.

Adding to 21852055 its reverse (55025812), we get a palindrome (76877867).

The spelling of 21852055 in words is "twenty-one million, eight hundred fifty-two thousand, fifty-five".