21803098570987 has 12 divisors (see below), whose sum is σ = 22532100807216. Its totient is φ = 21096621940320.

The previous prime is 21803098570951. The next prime is 21803098570993. The reversal of 21803098570987 is 78907589030812.

It is not a de Polignac number, because 21803098570987 - 2³⁹ = 21253342757099 is a prime.

It is a super-2 number, since 2×21803098570987² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21803098570937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43747503 + ... + 44243080.

It is an arithmetic number, because the mean of its divisors is an integer number (1877675067268).

Almost surely, 2^{21803098570987} is an apocalyptic number.

21803098570987 is a deficient number, since it is larger than the sum of its proper divisors (729002236229).

21803098570987 is an equidigital number, since it uses as much as digits as its factorization.

21803098570987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87990838 (or 87990801 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 67.

The spelling of 21803098570987 in words is "twenty-one trillion, eight hundred three billion, ninety-eight million, five hundred seventy thousand, nine hundred eighty-seven".