221011057 has 2 divisors, whose sum is σ = 221011058. Its totient is φ = 221011056.

The previous prime is 221010971. The next prime is 221011073. The reversal of 221011057 is 750110122.

221011057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175191696 + 45819361 = 13236^2 + 6769^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011057 - 2⁷ = 221010929 is a prime.

It is not a weakly prime, because it can be changed into another prime (221011157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505528 + 110505529.

It is an arithmetic number, because the mean of its divisors is an integer number (110505529).

Almost surely, 2^221011057 is an apocalyptic number.

It is an amenable number.

221011057 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011057 is an equidigital number, since it uses as much as digits as its factorization.

221011057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 221011057 is about 14866.4406298212. The cubic root of 221011057 is about 604.6044423891.

Adding to 221011057 its reverse (750110122), we get a palindrome (971121179).

The spelling of 221011057 in words is "two hundred twenty-one million, eleven thousand, fifty-seven".