105421555 has 4 divisors (see below), whose sum is σ = 126505872. Its totient is φ = 84337240.

The previous prime is 105421553. The next prime is 105421559. The reversal of 105421555 is 555124501.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 105421555 - 2¹ = 105421553 is a prime.

It is a super-2 number, since 2×105421555² = 22227408517236050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105421553) 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, 10542151 + ... + 10542160.

It is an arithmetic number, because the mean of its divisors is an integer number (31626468).

Almost surely, 2^105421555 is an apocalyptic number.

105421555 is a deficient number, since it is larger than the sum of its proper divisors (21084317).

105421555 is an equidigital number, since it uses as much as digits as its factorization.

105421555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21084316.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 105421555 is about 10267.4999391283. The cubic root of 105421555 is about 472.3999097456.

The spelling of 105421555 in words is "one hundred five million, four hundred twenty-one thousand, five hundred fifty-five".