105721144 has 16 divisors (see below), whose sum is σ = 200191320. Its totient is φ = 52336800.

The previous prime is 105721123. The next prime is 105721151. The reversal of 105721144 is 441127501.

It is a super-2 number, since 2×105721144² = 22353920577337472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64614 + ... + 66229.

Almost surely, 2^105721144 is an apocalyptic number.

It is an amenable number.

105721144 is a deficient number, since it is larger than the sum of its proper divisors (94470176).

105721144 is a wasteful number, since it uses less digits than its factorization.

105721144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130950 (or 130946 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 105721144 is about 10282.0787781460. The cubic root of 105721144 is about 472.8469782293.

Adding to 105721144 its reverse (441127501), we get a palindrome (546848645).

It can be divided in two parts, 1057 and 21144, that added together give a square (22201 = 149²).

The spelling of 105721144 in words is "one hundred five million, seven hundred twenty-one thousand, one hundred forty-four".