21111210111999 has 8 divisors (see below), whose sum is σ = 32169463027840. Its totient is φ = 12063548635416.

The previous prime is 21111210111991. The next prime is 21111210112049. The reversal of 21111210111999 is 99911101211112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21111210111999 - 2³ = 21111210111991 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 (21111210111991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502647859789 + ... + 502647859830.

It is an arithmetic number, because the mean of its divisors is an integer number (4021182878480).

Almost surely, 2^{21111210111999} is an apocalyptic number.

21111210111999 is a deficient number, since it is larger than the sum of its proper divisors (11058252915841).

21111210111999 is a wasteful number, since it uses less digits than its factorization.

21111210111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005295719629.

The product of its (nonzero) digits is 2916, while the sum is 39.

The spelling of 21111210111999 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, one hundred eleven thousand, nine hundred ninety-nine".