21110220123111 has 36 divisors (see below), whose sum is σ = 36615137143104. Its totient is φ = 11673854438400.

The previous prime is 21110220123103. The next prime is 21110220123137. The reversal of 21110220123111 is 11132102201112.

It is a happy number.

21110220123111 is a `hidden beast` number, since 21 + 110 + 220 + 1 + 2 + 311 + 1 = 666.

It is not a de Polignac number, because 21110220123111 - 2³ = 21110220123103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110220123101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 772066650 + ... + 772093991.

It is an arithmetic number, because the mean of its divisors is an integer number (1017087142864).

Almost surely, 2^{21110220123111} is an apocalyptic number.

21110220123111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21110220123111 is a deficient number, since it is larger than the sum of its proper divisors (15504917019993).

21110220123111 is a wasteful number, since it uses less digits than its factorization.

21110220123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544160692 (or 1544160682 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21110220123111 its reverse (11132102201112), we get a palindrome (32242322324223).

The spelling of 21110220123111 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty million, one hundred twenty-three thousand, one hundred eleven".