111110021122221 has 12 divisors (see below), whose sum is σ = 175082457526080. Its totient is φ = 67339406740680.

The previous prime is 111110021122211. The next prime is 111110021122237. The reversal of 111110021122221 is 122221120011111.

It is a happy number.

111110021122221 is a `hidden beast` number, since 1 + 111 + 100 + 211 + 22 + 221 = 666.

It is not a de Polignac number, because 111110021122221 - 2¹⁸ = 111110020860077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111110021122194 and 111110021122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111110021122201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 561161722741 + ... + 561161722938.

It is an arithmetic number, because the mean of its divisors is an integer number (14590204793840).

Almost surely, 2^{111110021122221} is an apocalyptic number.

111110021122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111110021122221 is a deficient number, since it is larger than the sum of its proper divisors (63972436403859).

111110021122221 is a wasteful number, since it uses less digits than its factorization.

111110021122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122323445696 (or 1122323445693 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111110021122221 its reverse (122221120011111), we get a palindrome (233331141133332).

The spelling of 111110021122221 in words is "one hundred eleven trillion, one hundred ten billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".