221560873 has 2 divisors, whose sum is σ = 221560874. Its totient is φ = 221560872.

The previous prime is 221560861. The next prime is 221560877. The reversal of 221560873 is 378065122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204146944 + 17413929 = 14288^2 + 4173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221560873 is a prime.

It is a super-3 number, since 3×221560873³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (221560877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110780436 + 110780437.

It is an arithmetic number, because the mean of its divisors is an integer number (110780437).

Almost surely, 2^221560873 is an apocalyptic number.

It is an amenable number.

221560873 is a deficient number, since it is larger than the sum of its proper divisors (1).

221560873 is an equidigital number, since it uses as much as digits as its factorization.

221560873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 221560873 is about 14884.9209940799. The cubic root of 221560873 is about 605.1053915615.

The spelling of 221560873 in words is "two hundred twenty-one million, five hundred sixty thousand, eight hundred seventy-three".