21853084 has 36 divisors (see below), whose sum is σ = 42446152. Its totient is φ = 9836640.

The previous prime is 21853079. The next prime is 21853093. The reversal of 21853084 is 48035812.

It is a super-2 number, since 2×21853084² = 955114560622112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78754 + ... + 79030.

Almost surely, 2^21853084 is an apocalyptic number.

It is an amenable number.

21853084 is a deficient number, since it is larger than the sum of its proper divisors (20593068).

21853084 is a wasteful number, since it uses less digits than its factorization.

21853084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 21853084 is about 4674.7282273946. The cubic root of 21853084 is about 279.5788055046.

Adding to 21853084 its reverse (48035812), we get a palindrome (69888896).

The spelling of 21853084 in words is "twenty-one million, eight hundred fifty-three thousand, eighty-four".