111111010022221 has 96 divisors (see below), whose sum is σ = 136359017561088. Its totient is φ = 89977536000000.

The previous prime is 111111010022183. The next prime is 111111010022261. The reversal of 111111010022221 is 122220010111111.

It is not a de Polignac number, because 111111010022221 - 2³⁵ = 111076650283853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111111010022195 and 111111010022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111010022261) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8605911756 + ... + 8605924666.

It is an arithmetic number, because the mean of its divisors is an integer number (1420406432928).

Almost surely, 2^{111111010022221} is an apocalyptic number.

111111010022221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111111010022221 is a deficient number, since it is larger than the sum of its proper divisors (25248007538867).

111111010022221 is a wasteful number, since it uses less digits than its factorization.

111111010022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14875 (or 14864 counting only the distinct ones).

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

Adding to 111111010022221 its reverse (122220010111111), we get a palindrome (233331020133332).

The spelling of 111111010022221 in words is "one hundred eleven trillion, one hundred eleven billion, ten million, twenty-two thousand, two hundred twenty-one".