61020221 has 2 divisors, whose sum is σ = 61020222. Its totient is φ = 61020220.

The previous prime is 61020209. The next prime is 61020233. The reversal of 61020221 is 12202016.

61020221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (61020209) and next prime (61020233).

It can be written as a sum of positive squares in only one way, i.e., 40896025 + 20124196 = 6395^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 61020221 - 2¹⁰ = 61019197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61020196 and 61020205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61020821) 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 as a sum of consecutive naturals, namely, 30510110 + 30510111.

It is an arithmetic number, because the mean of its divisors is an integer number (30510111).

Almost surely, 2^61020221 is an apocalyptic number.

It is an amenable number.

61020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61020221 is an equidigital number, since it uses as much as digits as its factorization.

61020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 61020221 is about 7811.5440855186. The cubic root of 61020221 is about 393.6932107231.

Adding to 61020221 its reverse (12202016), we get a palindrome (73222237).

The spelling of 61020221 in words is "sixty-one million, twenty thousand, two hundred twenty-one".