106221 has 4 divisors (see below), whose sum is σ = 141632. Its totient is φ = 70812.

The previous prime is 106219. The next prime is 106243. The reversal of 106221 is 122601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122601 = 3 ⋅40867.

It is not a de Polignac number, because 106221 - 2¹ = 106219 is a prime.

It is a super-2 number, since 2×106221² = 22565801682, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 106197 and 106206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17701 + ... + 17706.

It is an arithmetic number, because the mean of its divisors is an integer number (35408).

2¹⁰⁶²²¹ is an apocalyptic number.

It is an amenable number.

106221 is a deficient number, since it is larger than the sum of its proper divisors (35411).

106221 is an equidigital number, since it uses as much as digits as its factorization.

106221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35410.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 106221 is about 325.9156332550. The cubic root of 106221 is about 47.3591023254.

Adding to 106221 its reverse (122601), we get a palindrome (228822).

The spelling of 106221 in words is "one hundred six thousand, two hundred twenty-one".