105721957715 has 16 divisors (see below), whose sum is σ = 138406967136. Its totient is φ = 76884633600.

The previous prime is 105721957703. The next prime is 105721957727. The reversal of 105721957715 is 517759127501.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (105721957703) and next prime (105721957727).

It is not a de Polignac number, because 105721957715 - 2⁴ = 105721957699 is a prime.

It is a super-2 number, since 2×105721957715² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1345205 + ... + 1421625.

It is an arithmetic number, because the mean of its divisors is an integer number (8650435446).

Almost surely, 2^105721957715 is an apocalyptic number.

105721957715 is a deficient number, since it is larger than the sum of its proper divisors (32685009421).

105721957715 is a wasteful number, since it uses less digits than its factorization.

105721957715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101590.

The product of its (nonzero) digits is 771750, while the sum is 50.

The spelling of 105721957715 in words is "one hundred five billion, seven hundred twenty-one million, nine hundred fifty-seven thousand, seven hundred fifteen".