105605021 has 8 divisors (see below), whose sum is σ = 111902400. Its totient is φ = 99381600.

The previous prime is 105605011. The next prime is 105605023. The reversal of 105605021 is 120506501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105605021 - 2²² = 101410717 is a prime.

It is a super-2 number, since 2×105605021² = 22304840920820882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 105604984 and 105605002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105605023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15536 + ... + 21273.

It is an arithmetic number, because the mean of its divisors is an integer number (13987800).

Almost surely, 2^105605021 is an apocalyptic number.

It is an amenable number.

105605021 is a deficient number, since it is larger than the sum of its proper divisors (6297379).

105605021 is a wasteful number, since it uses less digits than its factorization.

105605021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36979.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 105605021 is about 10276.4303627281. The cubic root of 105605021 is about 472.6737914114.

The spelling of 105605021 in words is "one hundred five million, six hundred five thousand, twenty-one".