610101221 has 2 divisors, whose sum is σ = 610101222. Its totient is φ = 610101220.

The previous prime is 610101187. The next prime is 610101257. The reversal of 610101221 is 122101016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349278721 + 260822500 = 18689^2 + 16150^2 .

It is a cyclic number.

It is not a de Polignac number, because 610101221 - 2¹⁴ = 610084837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 610101196 and 610101205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610101521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305050610 + 305050611.

It is an arithmetic number, because the mean of its divisors is an integer number (305050611).

Almost surely, 2^610101221 is an apocalyptic number.

It is an amenable number.

610101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

610101221 is an equidigital number, since it uses as much as digits as its factorization.

610101221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 610101221 is about 24700.2271447046. The cubic root of 610101221 is about 848.1395159713.

Adding to 610101221 its reverse (122101016), we get a palindrome (732202237).

The spelling of 610101221 in words is "six hundred ten million, one hundred one thousand, two hundred twenty-one".