221667157 has 2 divisors, whose sum is σ = 221667158. Its totient is φ = 221667156.

The previous prime is 221667133. The next prime is 221667209. The reversal of 221667157 is 751766122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122744241 + 98922916 = 11079^2 + 9946^2 .

It is a cyclic number.

It is not a de Polignac number, because 221667157 - 2¹¹ = 221665109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221667757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110833578 + 110833579.

It is an arithmetic number, because the mean of its divisors is an integer number (110833579).

Almost surely, 2^221667157 is an apocalyptic number.

It is an amenable number.

221667157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221667157 is an equidigital number, since it uses as much as digits as its factorization.

221667157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 37.

The square root of 221667157 is about 14888.4907562855. The cubic root of 221667157 is about 605.2021335833.

The spelling of 221667157 in words is "two hundred twenty-one million, six hundred sixty-seven thousand, one hundred fifty-seven".