21110220011111 has 24 divisors (see below), whose sum is σ = 27671607140352. Its totient is φ = 15734325459600.

The previous prime is 21110220011099. The next prime is 21110220011137. The reversal of 21110220011111 is 11111002201112.

It is not a de Polignac number, because 21110220011111 - 2³⁰ = 21109146269287 is a prime.

It is a super-2 number, since 2×21110220011111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110220011141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 541796135 + ... + 541835096.

It is an arithmetic number, because the mean of its divisors is an integer number (1152983630848).

Almost surely, 2^{21110220011111} is an apocalyptic number.

21110220011111 is a deficient number, since it is larger than the sum of its proper divisors (6561387129241).

21110220011111 is a wasteful number, since it uses less digits than its factorization.

21110220011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083631283 (or 1083631272 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21110220011111 its reverse (11111002201112), we get a palindrome (32221222212223).

The spelling of 21110220011111 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty million, eleven thousand, one hundred eleven".