21200212111111 has 8 divisors (see below), whose sum is σ = 24133047778944. Its totient is φ = 18434967052920.

The previous prime is 21200212111079. The next prime is 21200212111123. The reversal of 21200212111111 is 11111121200212.

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

It is not a de Polignac number, because 21200212111111 - 2⁵ = 21200212111079 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 (21200212111171) 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, 41897652141 + ... + 41897652646.

It is an arithmetic number, because the mean of its divisors is an integer number (3016630972368).

Almost surely, 2^{21200212111111} is an apocalyptic number.

21200212111111 is a deficient number, since it is larger than the sum of its proper divisors (2932835667833).

21200212111111 is a wasteful number, since it uses less digits than its factorization.

21200212111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83795304821.

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

Adding to 21200212111111 its reverse (11111121200212), we get a palindrome (32311333311323).

It can be divided in two parts, 21200212 and 111111, that multiplied together give a palindrome (2355576755532).

The spelling of 21200212111111 in words is "twenty-one trillion, two hundred billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".