21011001199999 has 4 divisors (see below), whose sum is σ = 22116843368440. Its totient is φ = 19905159031560.

The previous prime is 21011001199973. The next prime is 21011001200027. The reversal of 21011001199999 is 99999110011012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21011001199999 - 2¹⁷ = 21011001068927 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 (21011001199919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552921084192 + ... + 552921084229.

It is an arithmetic number, because the mean of its divisors is an integer number (5529210842110).

Almost surely, 2^{21011001199999} is an apocalyptic number.

21011001199999 is a deficient number, since it is larger than the sum of its proper divisors (1105842168441).

21011001199999 is a wasteful number, since it uses less digits than its factorization.

21011001199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105842168440.

The product of its (nonzero) digits is 118098, while the sum is 52.

The spelling of 21011001199999 in words is "twenty-one trillion, eleven billion, one million, one hundred ninety-nine thousand, nine hundred ninety-nine".