21853083 has 16 divisors (see below), whose sum is σ = 33608960. Its totient is φ = 12371616.

The previous prime is 21853079. The next prime is 21853093. The reversal of 21853083 is 38035812.

It is a happy number.

It is not a de Polignac number, because 21853083 - 2² = 21853079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21853083.

It is not an unprimeable number, because it can be changed into a prime (21853043) 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, 2485 + ... + 7062.

It is an arithmetic number, because the mean of its divisors is an integer number (2100560).

Almost surely, 2^21853083 is an apocalyptic number.

21853083 is a deficient number, since it is larger than the sum of its proper divisors (11755877).

21853083 is a wasteful number, since it uses less digits than its factorization.

21853083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9666.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21853083 is about 4674.7281204365. The cubic root of 21853083 is about 279.5788012401.

Adding to 21853083 its reverse (38035812), we get a palindrome (59888895).

It can be divided in two parts, 218 and 53083, that added together give a triangular number (53301 = T₃₂₆).

The spelling of 21853083 in words is "twenty-one million, eight hundred fifty-three thousand, eighty-three".