106551221 has 8 divisors (see below), whose sum is σ = 128182080. Its totient is φ = 86522688.

The previous prime is 106551199. The next prime is 106551271. The reversal of 106551221 is 122155601.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 106551221 - 2¹⁴ = 106534837 is a prime.

It is a super-2 number, since 2×106551221² = 22706325393181682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106551271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400436 + ... + 400701.

It is an arithmetic number, because the mean of its divisors is an integer number (16022760).

Almost surely, 2^106551221 is an apocalyptic number.

It is an amenable number.

106551221 is a deficient number, since it is larger than the sum of its proper divisors (21630859).

106551221 is an equidigital number, since it uses as much as digits as its factorization.

106551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801163.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 106551221 is about 10322.3650875175. The cubic root of 106551221 is about 474.0812838698.

The spelling of 106551221 in words is "one hundred six million, five hundred fifty-one thousand, two hundred twenty-one".