105347821 has 4 divisors (see below), whose sum is σ = 107589312. Its totient is φ = 103106332.

The previous prime is 105347791. The next prime is 105347839. The reversal of 105347821 is 128743501.

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.

It is a cyclic number.

It is not a de Polignac number, because 105347821 - 2⁵ = 105347789 is a prime.

It is a super-2 number, since 2×105347821² = 22196326778896082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105344821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1120675 + ... + 1120768.

It is an arithmetic number, because the mean of its divisors is an integer number (26897328).

Almost surely, 2^105347821 is an apocalyptic number.

It is an amenable number.

105347821 is a deficient number, since it is larger than the sum of its proper divisors (2241491).

105347821 is an equidigital number, since it uses as much as digits as its factorization.

105347821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241490.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 105347821 is about 10263.9086609342. The cubic root of 105347821 is about 472.2897486600.

The spelling of 105347821 in words is "one hundred five million, three hundred forty-seven thousand, eight hundred twenty-one".