105440121021 has 8 divisors (see below), whose sum is σ = 140866326720. Its totient is φ = 70153664672.

The previous prime is 105440121019. The next prime is 105440121023. The reversal of 105440121021 is 120121044501.

It is an interprime number because it is at equal distance from previous prime (105440121019) and next prime (105440121023).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105440121021 - 2¹ = 105440121019 is a prime.

It is a super-2 number, since 2×105440121021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105440121023) 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 7 ways as a sum of consecutive naturals, for example, 34935576 + ... + 34938593.

It is an arithmetic number, because the mean of its divisors is an integer number (17608290840).

Almost surely, 2^105440121021 is an apocalyptic number.

It is an amenable number.

105440121021 is a deficient number, since it is larger than the sum of its proper divisors (35426205699).

105440121021 is an equidigital number, since it uses as much as digits as its factorization.

105440121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69874675.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 105440121021 its reverse (120121044501), we get a palindrome (225561165522).

The spelling of 105440121021 in words is "one hundred five billion, four hundred forty million, one hundred twenty-one thousand, twenty-one".