21853107 has 6 divisors (see below), whose sum is σ = 31565612. Its totient is φ = 14568732.

The previous prime is 21853103. The next prime is 21853121. The reversal of 21853107 is 70135812.

It is not a de Polignac number, because 21853107 - 2² = 21853103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21853103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1214053 + ... + 1214070.

Almost surely, 2^21853107 is an apocalyptic number.

21853107 is a deficient number, since it is larger than the sum of its proper divisors (9712505).

21853107 is a wasteful number, since it uses less digits than its factorization.

21853107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428129 (or 2428126 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 21853107 is about 4674.7306874300. The cubic root of 21853107 is about 279.5789035886.

Adding to 21853107 its reverse (70135812), we get a palindrome (91988919).

The spelling of 21853107 in words is "twenty-one million, eight hundred fifty-three thousand, one hundred seven".