221159857 has 2 divisors, whose sum is σ = 221159858. Its totient is φ = 221159856.

The previous prime is 221159803. The next prime is 221159893. The reversal of 221159857 is 758951122.

221159857 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., 165791376 + 55368481 = 12876^2 + 7441^2 .

It is a cyclic number.

It is not a de Polignac number, because 221159857 - 2¹¹ = 221157809 is a prime.

It is not a weakly prime, because it can be changed into another prime (221159557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110579928 + 110579929.

It is an arithmetic number, because the mean of its divisors is an integer number (110579929).

Almost surely, 2^221159857 is an apocalyptic number.

It is an amenable number.

221159857 is a deficient number, since it is larger than the sum of its proper divisors (1).

221159857 is an equidigital number, since it uses as much as digits as its factorization.

221159857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 40.

The square root of 221159857 is about 14871.4443481459. Note that the first 3 decimals coincide. The cubic root of 221159857 is about 604.7400991892.

The spelling of 221159857 in words is "two hundred twenty-one million, one hundred fifty-nine thousand, eight hundred fifty-seven".