105121543441 has 4 divisors (see below), whose sum is σ = 105291919332. Its totient is φ = 104951167552.

The previous prime is 105121543421. The next prime is 105121543453. The reversal of 105121543441 is 144345121501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144345121501 = 7 ⋅20620731643.

It can be written as a sum of positive squares in 2 ways, for example, as 20034987025 + 85086556416 = 141545^2 + 291696^2 .

It is a cyclic number.

It is not a de Polignac number, because 105121543441 - 2¹⁷ = 105121412369 is a prime.

It is a super-2 number, since 2×105121543441² (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 (105121543421) 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, 85187020 + ... + 85188253.

It is an arithmetic number, because the mean of its divisors is an integer number (26322979833).

Almost surely, 2^105121543441 is an apocalyptic number.

It is an amenable number.

105121543441 is a deficient number, since it is larger than the sum of its proper divisors (170375891).

105121543441 is an equidigital number, since it uses as much as digits as its factorization.

105121543441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170375890.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 105121543441 its reverse (144345121501), we get a palindrome (249466664942).

The spelling of 105121543441 in words is "one hundred five billion, one hundred twenty-one million, five hundred forty-three thousand, four hundred forty-one".