106221221 has 4 divisors (see below), whose sum is σ = 109647744. Its totient is φ = 102794700.

The previous prime is 106221209. The next prime is 106221259. The reversal of 106221221 is 122122601.

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: 122122601 = 5569 ⋅21929.

It is a cyclic number.

It is not a de Polignac number, because 106221221 - 2¹⁰ = 106220197 is a prime.

It is a super-2 number, since 2×106221221² = 22565895581461682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 106221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106221121) 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, 1713215 + ... + 1713276.

It is an arithmetic number, because the mean of its divisors is an integer number (27411936).

Almost surely, 2^106221221 is an apocalyptic number.

It is an amenable number.

106221221 is a deficient number, since it is larger than the sum of its proper divisors (3426523).

106221221 is an equidigital number, since it uses as much as digits as its factorization.

106221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426522.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 106221221 is about 10306.3679829511. The cubic root of 106221221 is about 473.5913516999.

Adding to 106221221 its reverse (122122601), we get a palindrome (228343822).

The spelling of 106221221 in words is "one hundred six million, two hundred twenty-one thousand, two hundred twenty-one".