111010021209 has 28 divisors (see below), whose sum is σ = 166471161892. Its totient is φ = 73992333600.

The previous prime is 111010021159. The next prime is 111010021217. The reversal of 111010021209 is 902120010111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 104277326400 + 6732694809 = 322920^2 + 82053^2 .

It is not a de Polignac number, because 111010021209 - 2⁷ = 111010021081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111010021191 and 111010021200.

It is not an unprimeable number, because it can be changed into a prime (111010021009) 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 27 ways as a sum of consecutive naturals, for example, 4844439 + ... + 4867299.

It is an arithmetic number, because the mean of its divisors is an integer number (5945398639).

Almost surely, 2^111010021209 is an apocalyptic number.

It is an amenable number.

111010021209 is a deficient number, since it is larger than the sum of its proper divisors (55461140683).

111010021209 is an frugal number, since it uses more digits than its factorization.

111010021209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29540 (or 29525 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 111010021209 in words is "one hundred eleven billion, ten million, twenty-one thousand, two hundred nine".