105421855 has 64 divisors (see below), whose sum is σ = 166404096. Its totient is φ = 62726400.

The previous prime is 105421829. The next prime is 105421867. The reversal of 105421855 is 558124501.

It is not a de Polignac number, because 105421855 - 2¹³ = 105413663 is a prime.

It is a super-2 number, since 2×105421855² = 22227535023282050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

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 63 ways as a sum of consecutive naturals, for example, 1444099 + ... + 1444171.

It is an arithmetic number, because the mean of its divisors is an integer number (2600064).

Almost surely, 2^105421855 is an apocalyptic number.

105421855 is a deficient number, since it is larger than the sum of its proper divisors (60982241).

105421855 is an equidigital number, since it uses as much as digits as its factorization.

105421855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 105421855 is about 10267.5145483218. The cubic root of 105421855 is about 472.4003578508.

It can be divided in two parts, 105421 and 855, that added together give a square (106276 = 326²).

The spelling of 105421855 in words is "one hundred five million, four hundred twenty-one thousand, eight hundred fifty-five".