221136101 has 4 divisors (see below), whose sum is σ = 221333100. Its totient is φ = 220939104.

The previous prime is 221136067. The next prime is 221136121. The reversal of 221136101 is 101631122.

221136101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 108139201 + 112996900 = 10399^2 + 10630^2 .

It is a cyclic number.

It is not a de Polignac number, because 221136101 - 2⁶ = 221136037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221136101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221136121) 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, 96806 + ... + 99063.

It is an arithmetic number, because the mean of its divisors is an integer number (55333275).

Almost surely, 2^221136101 is an apocalyptic number.

It is an amenable number.

221136101 is a deficient number, since it is larger than the sum of its proper divisors (196999).

221136101 is a wasteful number, since it uses less digits than its factorization.

221136101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196998.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 221136101 is about 14870.6456147674. The cubic root of 221136101 is about 604.7184455907.

Adding to 221136101 its reverse (101631122), we get a palindrome (322767223).

The spelling of 221136101 in words is "two hundred twenty-one million, one hundred thirty-six thousand, one hundred one".