106823921 has 4 divisors (see below), whose sum is σ = 109711092. Its totient is φ = 103936752.

The previous prime is 106823917. The next prime is 106823933. The reversal of 106823921 is 129328601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88642225 + 18181696 = 9415^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 106823921 - 2² = 106823917 is a prime.

It is a super-2 number, since 2×106823921² = 22822700195628482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106820921) 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, 1443530 + ... + 1443603.

It is an arithmetic number, because the mean of its divisors is an integer number (27427773).

Almost surely, 2^106823921 is an apocalyptic number.

It is an amenable number.

106823921 is a deficient number, since it is larger than the sum of its proper divisors (2887171).

106823921 is an equidigital number, since it uses as much as digits as its factorization.

106823921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887170.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 106823921 is about 10335.5658287295. The cubic root of 106823921 is about 474.4853831991.

The spelling of 106823921 in words is "one hundred six million, eight hundred twenty-three thousand, nine hundred twenty-one".