21112200111111 has 32 divisors (see below), whose sum is σ = 30611590849728. Its totient is φ = 12888603371520.

The previous prime is 21112200111061. The next prime is 21112200111181. The reversal of 21112200111111 is 11111100221112.

It is not a de Polignac number, because 21112200111111 - 2¹⁸ = 21112199848967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112200111181) 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 31 ways as a sum of consecutive naturals, for example, 195463741 + ... + 195571721.

It is an arithmetic number, because the mean of its divisors is an integer number (956612214054).

Almost surely, 2^{21112200111111} is an apocalyptic number.

21112200111111 is a deficient number, since it is larger than the sum of its proper divisors (9499390738617).

21112200111111 is a wasteful number, since it uses less digits than its factorization.

21112200111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211651.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21112200111111 its reverse (11111100221112), we get a palindrome (32223300332223).

The spelling of 21112200111111 in words is "twenty-one trillion, one hundred twelve billion, two hundred million, one hundred eleven thousand, one hundred eleven".