111002100221 has 4 divisors (see below), whose sum is σ = 112821806844. Its totient is φ = 109182393600.

The previous prime is 111002100203. The next prime is 111002100229. The reversal of 111002100221 is 122001200111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64445407321 + 46556692900 = 253861^2 + 215770^2 .

It is a cyclic number.

It is not a de Polignac number, because 111002100221 - 2¹⁴ = 111002083837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111002100229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909853220 + ... + 909853341.

It is an arithmetic number, because the mean of its divisors is an integer number (28205451711).

Almost surely, 2^111002100221 is an apocalyptic number.

It is an amenable number.

111002100221 is a deficient number, since it is larger than the sum of its proper divisors (1819706623).

111002100221 is an equidigital number, since it uses as much as digits as its factorization.

111002100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819706622.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111002100221 its reverse (122001200111), we get a palindrome (233003300332).

The spelling of 111002100221 in words is "one hundred eleven billion, two million, one hundred thousand, two hundred twenty-one".