208220101 has 2 divisors, whose sum is σ = 208220102. Its totient is φ = 208220100.

The previous prime is 208220071. The next prime is 208220113. The reversal of 208220101 is 101022802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122213025 + 86007076 = 11055^2 + 9274^2 .

It is a cyclic number.

It is not a de Polignac number, because 208220101 - 2¹⁵ = 208187333 is a prime.

It is a super-2 number, since 2×208220101² = 86711220920900402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208220141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104110050 + 104110051.

It is an arithmetic number, because the mean of its divisors is an integer number (104110051).

Almost surely, 2^208220101 is an apocalyptic number.

It is an amenable number.

208220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

208220101 is an equidigital number, since it uses as much as digits as its factorization.

208220101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 208220101 is about 14429.8337135256. The cubic root of 208220101 is about 592.7081298635.

Adding to 208220101 its reverse (101022802), we get a palindrome (309242903).

The spelling of 208220101 in words is "two hundred eight million, two hundred twenty thousand, one hundred one".