221120002100 has 18 divisors (see below), whose sum is σ = 479830404774. Its totient is φ = 88448000800.

The previous prime is 221120002091. The next prime is 221120002121. The reversal of 221120002100 is 1200021122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 31835837476 + 189284164624 = 178426^2 + 435068^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105599911 + ... + 1105600110.

Almost surely, 2^221120002100 is an apocalyptic number.

221120002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120002100 is an abundant number, since it is smaller than the sum of its proper divisors (258710402674).

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

221120002100 is a wasteful number, since it uses less digits than its factorization.

221120002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211200035 (or 2211200028 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221120002100 its reverse (1200021122), we get a palindrome (222320023222).

The spelling of 221120002100 in words is "two hundred twenty-one billion, one hundred twenty million, two thousand, one hundred".