101660221 has 16 divisors (see below), whose sum is σ = 117836208. Its totient is φ = 86860800.

The previous prime is 101660219. The next prime is 101660231. The reversal of 101660221 is 122066101.

It can be written as a sum of positive squares in 8 ways, for example, as 29648025 + 72012196 = 5445^2 + 8486^2 .

It is not a de Polignac number, because 101660221 - 2¹ = 101660219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101660231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9711 + ... + 17251.

It is an arithmetic number, because the mean of its divisors is an integer number (7364763).

Almost surely, 2^101660221 is an apocalyptic number.

It is an amenable number.

101660221 is a deficient number, since it is larger than the sum of its proper divisors (16175987).

101660221 is a wasteful number, since it uses less digits than its factorization.

101660221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 101660221 is about 10082.6693390193. The cubic root of 101660221 is about 466.7134854954.

The spelling of 101660221 in words is "one hundred one million, six hundred sixty thousand, two hundred twenty-one".