61104221 has 2 divisors, whose sum is σ = 61104222. Its totient is φ = 61104220.

The previous prime is 61104217. The next prime is 61104223. The reversal of 61104221 is 12240116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 4644025 = 7514^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 61104221 - 2² = 61104217 is a prime.

Together with 61104223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61104221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61104223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30552110 + 30552111.

It is an arithmetic number, because the mean of its divisors is an integer number (30552111).

Almost surely, 2^61104221 is an apocalyptic number.

It is an amenable number.

61104221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61104221 is an equidigital number, since it uses as much as digits as its factorization.

61104221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 61104221 is about 7816.9188942959. The cubic root of 61104221 is about 393.8737796449.

Adding to 61104221 its reverse (12240116), we get a palindrome (73344337).

The spelling of 61104221 in words is "sixty-one million, one hundred four thousand, two hundred twenty-one".