105244021 has 24 divisors (see below), whose sum is σ = 119359520. Its totient is φ = 92464416.

The previous prime is 105243997. The next prime is 105244043. The reversal of 105244021 is 120442501.

It is not a de Polignac number, because 105244021 - 2⁷ = 105243893 is a prime.

It is a super-2 number, since 2×105244021² = 22152607912496882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 105244021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105244621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371746 + ... + 372028.

Almost surely, 2^105244021 is an apocalyptic number.

It is an amenable number.

105244021 is a deficient number, since it is larger than the sum of its proper divisors (14115499).

105244021 is a wasteful number, since it uses less digits than its factorization.

105244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 105244021 is about 10258.8508615731. The cubic root of 105244021 is about 472.1345808062.

Adding to 105244021 its reverse (120442501), we get a palindrome (225686522).

The spelling of 105244021 in words is "one hundred five million, two hundred forty-four thousand, twenty-one".