221100036 has 48 divisors (see below), whose sum is σ = 544340160. Its totient is φ = 69655680.

The previous prime is 221099999. The next prime is 221100037. The reversal of 221100036 is 630001122.

It is a junction number, because it is equal to n+sod(n) for n = 221099988 and 221100024.

It is not an unprimeable number, because it can be changed into a prime (221100037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126126 + ... + 127866.

It is an arithmetic number, because the mean of its divisors is an integer number (11340420).

Almost surely, 2^221100036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221100036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272170080).

221100036 is an abundant number, since it is smaller than the sum of its proper divisors (323240124).

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

221100036 is a wasteful number, since it uses less digits than its factorization.

221100036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324 (or 2322 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221100036 is about 14869.4329414406. The cubic root of 221100036 is about 604.6855693720.

Adding to 221100036 its reverse (630001122), we get a palindrome (851101158).

The spelling of 221100036 in words is "two hundred twenty-one million, one hundred thousand, thirty-six".