21001113099 has 6 divisors (see below), whose sum is σ = 30334941156. Its totient is φ = 14000742060.

The previous prime is 21001113031. The next prime is 21001113109. The reversal of 21001113099 is 99031110012.

It is not a de Polignac number, because 21001113099 - 2⁷ = 21001112971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001113299) 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 5 ways as a sum of consecutive naturals, for example, 1166728497 + ... + 1166728514.

It is an arithmetic number, because the mean of its divisors is an integer number (5055823526).

Almost surely, 2^21001113099 is an apocalyptic number.

21001113099 is a deficient number, since it is larger than the sum of its proper divisors (9333828057).

21001113099 is a wasteful number, since it uses less digits than its factorization.

21001113099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333457017 (or 2333457014 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The spelling of 21001113099 in words is "twenty-one billion, one million, one hundred thirteen thousand, ninety-nine".