106731221 has 2 divisors, whose sum is σ = 106731222. Its totient is φ = 106731220.

The previous prime is 106731217. The next prime is 106731239. The reversal of 106731221 is 122137601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93122500 + 13608721 = 9650^2 + 3689^2 .

It is an emirp because it is prime and its reverse (122137601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 106731221 - 2² = 106731217 is a prime.

It is a super-2 number, since 2×106731221² = 22783107072301682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106731211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53365610 + 53365611.

It is an arithmetic number, because the mean of its divisors is an integer number (53365611).

Almost surely, 2^106731221 is an apocalyptic number.

It is an amenable number.

106731221 is a deficient number, since it is larger than the sum of its proper divisors (1).

106731221 is an equidigital number, since it uses as much as digits as its factorization.

106731221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 106731221 is about 10331.0803404097. The cubic root of 106731221 is about 474.3480933367.

Adding to 106731221 its reverse (122137601), we get a palindrome (228868822).

The spelling of 106731221 in words is "one hundred six million, seven hundred thirty-one thousand, two hundred twenty-one".