21311019999 has 32 divisors (see below), whose sum is σ = 31687165440. Its totient is φ = 14155580736.

The previous prime is 21311019997. The next prime is 21311020039. The reversal of 21311019999 is 99991011312.

It is not a de Polignac number, because 21311019999 - 2¹ = 21311019997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311019997) 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 31 ways as a sum of consecutive naturals, for example, 12860379 + ... + 12862035.

It is an arithmetic number, because the mean of its divisors is an integer number (990223920).

Almost surely, 2^21311019999 is an apocalyptic number.

21311019999 is a deficient number, since it is larger than the sum of its proper divisors (10376145441).

21311019999 is a wasteful number, since it uses less digits than its factorization.

21311019999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116 (or 3110 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 45.

The spelling of 21311019999 in words is "twenty-one billion, three hundred eleven million, nineteen thousand, nine hundred ninety-nine".