105112811295521 has 4 divisors (see below), whose sum is σ = 105114744387972. Its totient is φ = 105110878203072.

The previous prime is 105112811295511. The next prime is 105112811295587. The reversal of 105112811295521 is 125592118211501.

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 67682887295521 + 37429924000000 = 8226961^2 + 6118000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105112811295521 is a prime.

It is a super-2 number, since 2×105112811295521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105112811295511) 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, 966464660 + ... + 966573413.

It is an arithmetic number, because the mean of its divisors is an integer number (26278686096993).

Almost surely, 2^{105112811295521} is an apocalyptic number.

It is an amenable number.

105112811295521 is a deficient number, since it is larger than the sum of its proper divisors (1933092451).

105112811295521 is an equidigital number, since it uses as much as digits as its factorization.

105112811295521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933092450.

The product of its (nonzero) digits is 72000, while the sum is 44.

The spelling of 105112811295521 in words is "one hundred five trillion, one hundred twelve billion, eight hundred eleven million, two hundred ninety-five thousand, five hundred twenty-one".