111010021221 has 16 divisors (see below), whose sum is σ = 163067830848. Its totient is φ = 66612672000.

The previous prime is 111010021217. The next prime is 111010021261. The reversal of 111010021221 is 122120010111.

It is not a de Polignac number, because 111010021221 - 2² = 111010021217 is a prime.

It is a super-2 number, since 2×111010021221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111010021197 and 111010021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111010021261) 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 15 ways as a sum of consecutive naturals, for example, 16649836 + ... + 16656501.

It is an arithmetic number, because the mean of its divisors is an integer number (10191739428).

Almost surely, 2^111010021221 is an apocalyptic number.

111010021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111010021221 is a deficient number, since it is larger than the sum of its proper divisors (52057809627).

111010021221 is a wasteful number, since it uses less digits than its factorization.

111010021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33306452.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111010021221 its reverse (122120010111), we get a palindrome (233130031332).

The spelling of 111010021221 in words is "one hundred eleven billion, ten million, twenty-one thousand, two hundred twenty-one".