221077 has 2 divisors, whose sum is σ = 221078. Its totient is φ = 221076.

The previous prime is 221071. The next prime is 221083. The reversal of 221077 is 770122.

It is a balanced prime because it is at equal distance from previous prime (221071) and next prime (221083).

It can be written as a sum of positive squares in only one way, i.e., 181476 + 39601 = 426^2 + 199^2 .

It is a cyclic number.

It is not a de Polignac number, because 221077 - 2³ = 221069 is a prime.

It is a Chen prime.

It is an Ulam number.

It is equal to p₁₉₇₀₂ and since 221077 and 19702 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110538 + 110539.

It is an arithmetic number, because the mean of its divisors is an integer number (110539).

2²²¹⁰⁷⁷ is an apocalyptic number.

It is an amenable number.

221077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221077 is an equidigital number, since it uses as much as digits as its factorization.

221077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 221077 is about 470.1882601682. The cubic root of 221077 is about 60.4664568289.

Adding to 221077 its reverse (770122), we get a palindrome (991199).

The spelling of 221077 in words is "two hundred twenty-one thousand, seventy-seven", and thus it is an iban number.