106443821 has 6 divisors (see below), whose sum is σ = 117000366. Its totient is φ = 96767000.

The previous prime is 106443797. The next prime is 106443893. The reversal of 106443821 is 128344601.

It can be written as a sum of positive squares in only one way, i.e., 105781225 + 662596 = 10285^2 + 814^2 .

It is a de Polignac number, because none of the positive numbers 2^k-106443821 is a prime.

It is a super-2 number, since 2×106443821² = 22660574058160082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106443121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439730 + ... + 439971.

It is an arithmetic number, because the mean of its divisors is an integer number (19500061).

Almost surely, 2^106443821 is an apocalyptic number.

106443821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

106443821 is a deficient number, since it is larger than the sum of its proper divisors (10556545).

106443821 is an equidigital number, since it uses as much as digits as its factorization.

106443821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879723 (or 879712 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 106443821 is about 10317.1614797870. The cubic root of 106443821 is about 473.9219443950.

The spelling of 106443821 in words is "one hundred six million, four hundred forty-three thousand, eight hundred twenty-one".