105721816 has 16 divisors (see below), whose sum is σ = 198422640. Its totient is φ = 52809120.

The previous prime is 105721813. The next prime is 105721817. The reversal of 105721816 is 618127501.

It is a super-2 number, since 2×105721816² = 22354204756675712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105721813) 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, 3021 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (12401415).

Almost surely, 2^105721816 is an apocalyptic number.

It is an amenable number.

105721816 is a deficient number, since it is larger than the sum of its proper divisors (92700824).

105721816 is a wasteful number, since it uses less digits than its factorization.

105721816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12954 (or 12950 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 105721816 is about 10282.1114563109. Note that the first 3 decimals coincide. The cubic root of 105721816 is about 472.8479800865.

The spelling of 105721816 in words is "one hundred five million, seven hundred twenty-one thousand, eight hundred sixteen".