106806421 has 8 divisors (see below), whose sum is σ = 107504280. Its totient is φ = 106111488.

The previous prime is 106806379. The next prime is 106806443. The reversal of 106806421 is 124608601.

It can be written as a sum of positive squares in 4 ways, for example, as 2480625 + 104325796 = 1575^2 + 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 106806421 - 2¹³ = 106798229 is a prime.

It is a super-2 number, since 2×106806421² = 22815223133658482, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 106806421 parts by 14615 straight cuts.

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 106806421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106806521) 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, 187425 + ... + 187993.

It is an arithmetic number, because the mean of its divisors is an integer number (13438035).

Almost surely, 2^106806421 is an apocalyptic number.

It is an amenable number.

106806421 is a deficient number, since it is larger than the sum of its proper divisors (697859).

106806421 is an equidigital number, since it uses as much as digits as its factorization.

106806421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 106806421 is about 10334.7192027650. The cubic root of 106806421 is about 474.4594715631.

The spelling of 106806421 in words is "one hundred six million, eight hundred six thousand, four hundred twenty-one".