105150821 has 4 divisors (see below), whose sum is σ = 105220512. Its totient is φ = 105081132.

The previous prime is 105150757. The next prime is 105150823. The reversal of 105150821 is 128051501.

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 105150821 - 2⁶ = 105150757 is a prime.

It is a super-2 number, since 2×105150821² = 22113390313948082, 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 (105150823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32531 + ... + 35616.

It is an arithmetic number, because the mean of its divisors is an integer number (26305128).

Almost surely, 2^105150821 is an apocalyptic number.

It is an amenable number.

105150821 is a deficient number, since it is larger than the sum of its proper divisors (69691).

105150821 is an equidigital number, since it uses as much as digits as its factorization.

105150821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69690.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 105150821 is about 10254.3074363898. The cubic root of 105150821 is about 471.9951716565.

The spelling of 105150821 in words is "one hundred five million, one hundred fifty thousand, eight hundred twenty-one".