21096110851 has 4 divisors (see below), whose sum is σ = 21099170304. Its totient is φ = 21093051400.

The previous prime is 21096110803. The next prime is 21096110869. The reversal of 21096110851 is 15801169012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21096110851 - 2¹³ = 21096102659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21096110351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519360 + ... + 1533181.

It is an arithmetic number, because the mean of its divisors is an integer number (5274792576).

Almost surely, 2^21096110851 is an apocalyptic number.

21096110851 is a deficient number, since it is larger than the sum of its proper divisors (3059453).

21096110851 is an equidigital number, since it uses as much as digits as its factorization.

21096110851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059452.

The product of its (nonzero) digits is 4320, while the sum is 34.

Adding to 21096110851 its reverse (15801169012), we get a palindrome (36897279863).

The spelling of 21096110851 in words is "twenty-one billion, ninety-six million, one hundred ten thousand, eight hundred fifty-one".