105440021321 has 4 divisors (see below), whose sum is σ = 105485218692. Its totient is φ = 105394823952.

The previous prime is 105440021299. The next prime is 105440021327. The reversal of 105440021321 is 123120044501.

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 36228934921 + 69211086400 = 190339^2 + 263080^2 .

It is a cyclic number.

It is not a de Polignac number, because 105440021321 - 2¹⁴ = 105440004937 is a prime.

It is a super-2 number, since 2×105440021321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105440021327) 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, 22595186 + ... + 22599851.

It is an arithmetic number, because the mean of its divisors is an integer number (26371304673).

Almost surely, 2^105440021321 is an apocalyptic number.

It is an amenable number.

105440021321 is a deficient number, since it is larger than the sum of its proper divisors (45197371).

105440021321 is an equidigital number, since it uses as much as digits as its factorization.

105440021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45197370.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 105440021321 its reverse (123120044501), we get a palindrome (228560065822).

The spelling of 105440021321 in words is "one hundred five billion, four hundred forty million, twenty-one thousand, three hundred twenty-one".