221010061 has 4 divisors (see below), whose sum is σ = 222493500. Its totient is φ = 219526624.

The previous prime is 221010037. The next prime is 221010077. The reversal of 221010061 is 160010122.

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 120890025 + 100120036 = 10995^2 + 10006^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010061 - 2⁹ = 221009549 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 (221010001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741496 + ... + 741793.

It is an arithmetic number, because the mean of its divisors is an integer number (55623375).

Almost surely, 2^221010061 is an apocalyptic number.

It is an amenable number.

221010061 is a deficient number, since it is larger than the sum of its proper divisors (1483439).

221010061 is a wasteful number, since it uses less digits than its factorization.

221010061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483438.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221010061 is about 14866.4071315163. The cubic root of 221010061 is about 604.6035341586.

Adding to 221010061 its reverse (160010122), we get a palindrome (381020183).

The spelling of 221010061 in words is "two hundred twenty-one million, ten thousand, sixty-one".