105279887021 has 2 divisors, whose sum is σ = 105279887022. Its totient is φ = 105279887020.

The previous prime is 105279887017. The next prime is 105279887029. The reversal of 105279887021 is 120788972501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78056536996 + 27223350025 = 279386^2 + 164995^2 .

It is a cyclic number.

It is not a de Polignac number, because 105279887021 - 2² = 105279887017 is a prime.

It is a super-2 number, since 2×105279887021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105279887029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52639943510 + 52639943511.

It is an arithmetic number, because the mean of its divisors is an integer number (52639943511).

Almost surely, 2^105279887021 is an apocalyptic number.

It is an amenable number.

105279887021 is a deficient number, since it is larger than the sum of its proper divisors (1).

105279887021 is an equidigital number, since it uses as much as digits as its factorization.

105279887021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 105279887021 in words is "one hundred five billion, two hundred seventy-nine million, eight hundred eighty-seven thousand, twenty-one".