106621021 has 8 divisors (see below), whose sum is σ = 116114040. Its totient is φ = 97312512.

The previous prime is 106621019. The next prime is 106621049. The reversal of 106621021 is 120126601.

It can be written as a sum of positive squares in 4 ways, for example, as 2295225 + 104325796 = 1515^2 + 10214^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 106621021 - 2¹ = 106621019 is a prime.

It is a super-2 number, since 2×106621021² = 22736084238164882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 106621021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106621091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44920 + ... + 47233.

It is an arithmetic number, because the mean of its divisors is an integer number (14514255).

Almost surely, 2^106621021 is an apocalyptic number.

It is an amenable number.

106621021 is a deficient number, since it is larger than the sum of its proper divisors (9493019).

106621021 is an equidigital number, since it uses as much as digits as its factorization.

106621021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92255.

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

The square root of 106621021 is about 10325.7455420904. The cubic root of 106621021 is about 474.1847822942.

Adding to 106621021 its reverse (120126601), we get a palindrome (226747622).

The spelling of 106621021 in words is "one hundred six million, six hundred twenty-one thousand, twenty-one".