221505049 has 2 divisors, whose sum is σ = 221505050. Its totient is φ = 221505048.

The previous prime is 221505043. The next prime is 221505077. The reversal of 221505049 is 940505122.

It is an a-pointer prime, because the next prime (221505077) can be obtained adding 221505049 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217031824 + 4473225 = 14732^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 221505049 - 2⁵ = 221505017 is a prime.

It is not a weakly prime, because it can be changed into another prime (221505043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110752524 + 110752525.

It is an arithmetic number, because the mean of its divisors is an integer number (110752525).

Almost surely, 2^221505049 is an apocalyptic number.

It is an amenable number.

221505049 is a deficient number, since it is larger than the sum of its proper divisors (1).

221505049 is an equidigital number, since it uses as much as digits as its factorization.

221505049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 221505049 is about 14883.0456896430. The cubic root of 221505049 is about 605.0545669427.

The spelling of 221505049 in words is "two hundred twenty-one million, five hundred five thousand, forty-nine".