21603088813 has 24 divisors (see below), whose sum is σ = 23495421600. Its totient is φ = 19837296864.

The previous prime is 21603088799. The next prime is 21603088853. The reversal of 21603088813 is 31888030612.

It is not a de Polignac number, because 21603088813 - 2¹⁷ = 21602957741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603088853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2742106 + ... + 2749972.

It is an arithmetic number, because the mean of its divisors is an integer number (978975900).

Almost surely, 2^21603088813 is an apocalyptic number.

21603088813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21603088813 is a deficient number, since it is larger than the sum of its proper divisors (1892332787).

21603088813 is a wasteful number, since it uses less digits than its factorization.

21603088813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121 (or 8098 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 21603088813 in words is "twenty-one billion, six hundred three million, eighty-eight thousand, eight hundred thirteen".