21098816153 has 4 divisors (see below), whose sum is σ = 21122765748. Its totient is φ = 21074866560.

The previous prime is 21098816119. The next prime is 21098816173. The reversal of 21098816153 is 35161889012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14020454464 + 7078361689 = 118408^2 + 84133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21098816153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21098816173) 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, 11973476 + ... + 11975237.

It is an arithmetic number, because the mean of its divisors is an integer number (5280691437).

Almost surely, 2^21098816153 is an apocalyptic number.

It is an amenable number.

21098816153 is a deficient number, since it is larger than the sum of its proper divisors (23949595).

21098816153 is an equidigital number, since it uses as much as digits as its factorization.

21098816153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23949594.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 21098816153 in words is "twenty-one billion, ninety-eight million, eight hundred sixteen thousand, one hundred fifty-three".