21112312099 has 12 divisors (see below), whose sum is σ = 23250759696. Its totient is φ = 19131515568.

The previous prime is 21112312057. The next prime is 21112312159. The reversal of 21112312099 is 99021321112.

It is not a de Polignac number, because 21112312099 - 2⁷ = 21112311971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112312099.

It is not an unprimeable number, because it can be changed into a prime (21112312799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1263064 + ... + 1279669.

It is an arithmetic number, because the mean of its divisors is an integer number (1937563308).

Almost surely, 2^21112312099 is an apocalyptic number.

21112312099 is a deficient number, since it is larger than the sum of its proper divisors (2138447597).

21112312099 is a wasteful number, since it uses less digits than its factorization.

21112312099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542794 (or 2542775 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21112312099 in words is "twenty-one billion, one hundred twelve million, three hundred twelve thousand, ninety-nine".