21002112002111 has 8 divisors (see below), whose sum is σ = 21025318849920. Its totient is φ = 20978910247192.

The previous prime is 21002112002099. The next prime is 21002112002117. The reversal of 21002112002111 is 11120021120012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002112002111 - 2³⁸ = 20727234095167 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 (21002112002117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7008686 + ... + 9545988.

It is an arithmetic number, because the mean of its divisors is an integer number (2628164856240).

Almost surely, 2^{21002112002111} is an apocalyptic number.

21002112002111 is a deficient number, since it is larger than the sum of its proper divisors (23206847809).

21002112002111 is a wasteful number, since it uses less digits than its factorization.

21002112002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546445.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21002112002111 its reverse (11120021120012), we get a palindrome (32122133122123).

The spelling of 21002112002111 in words is "twenty-one trillion, two billion, one hundred twelve million, two thousand, one hundred eleven".