221111170002 has 54 divisors (see below), whose sum is σ = 483193890543. Its totient is φ = 73075300224.

The previous prime is 221111169959. The next prime is 221111170003. The reversal of 221111170002 is 200071111122.

It can be written as a sum of positive squares in 5 ways, for example, as 205880895081 + 15230274921 = 453741^2 + 123411^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332499.

It is a super-4 number, since 4×221111170002⁴ (a number of 46 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221111170003) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 273313774 + ... + 273314582.

Almost surely, 2^221111170002 is an apocalyptic number.

221111170002 is an abundant number, since it is smaller than the sum of its proper divisors (262082720541).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221111170002 is an frugal number, since it uses more digits than its factorization.

221111170002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

Multiplying 221111170002 by its sum of digits (18), we get a square (3980001060036 = 1994994²).

221111170002 divided by its sum of digits (18) gives a square (12283953889 = 110833²).

Adding to 221111170002 its reverse (200071111122), we get a palindrome (421182281124).

The spelling of 221111170002 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred seventy thousand, two".