21793105 has 4 divisors (see below), whose sum is σ = 26151732. Its totient is φ = 17434480.

The previous prime is 21793097. The next prime is 21793117. The reversal of 21793105 is 50139712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16703569 + 5089536 = 4087^2 + 2256^2 .

It is not a de Polignac number, because 21793105 - 2³ = 21793097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2179306 + ... + 2179315.

It is an arithmetic number, because the mean of its divisors is an integer number (6537933).

Almost surely, 2^21793105 is an apocalyptic number.

It is an amenable number.

21793105 is a deficient number, since it is larger than the sum of its proper divisors (4358627).

21793105 is an equidigital number, since it uses as much as digits as its factorization.

21793105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358626.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 21793105 is about 4668.3085802033. The cubic root of 21793105 is about 279.3227894332.

The spelling of 21793105 in words is "twenty-one million, seven hundred ninety-three thousand, one hundred five".