221707 has 2 divisors, whose sum is σ = 221708. Its totient is φ = 221706.

The previous prime is 221677. The next prime is 221713. The reversal of 221707 is 707122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221707 - 2¹⁵ = 188939 is a prime.

221707 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (221717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110853 + 110854.

It is an arithmetic number, because the mean of its divisors is an integer number (110854).

2²²¹⁷⁰⁷ is an apocalyptic number.

221707 is a deficient number, since it is larger than the sum of its proper divisors (1).

221707 is an equidigital number, since it uses as much as digits as its factorization.

221707 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 221707 is about 470.8577279816. The cubic root of 221707 is about 60.5238391584.

Adding to 221707 its reverse (707122), we get a palindrome (928829).

The spelling of 221707 in words is "two hundred twenty-one thousand, seven hundred seven", and thus it is an iban number.