21193105 has 16 divisors (see below), whose sum is σ = 26457984. Its totient is φ = 16283520.

The previous prime is 21193069. The next prime is 21193121. The reversal of 21193105 is 50139112.

It is a de Polignac number, because none of the positive numbers 2^k-21193105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12964 + ... + 14506.

It is an arithmetic number, because the mean of its divisors is an integer number (1653624).

Almost surely, 2^21193105 is an apocalyptic number.

It is an amenable number.

21193105 is a deficient number, since it is larger than the sum of its proper divisors (5264879).

21193105 is a wasteful number, since it uses less digits than its factorization.

21193105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 21193105 is about 4603.5969632452. The cubic root of 21193105 is about 276.7354927879.

The spelling of 21193105 in words is "twenty-one million, one hundred ninety-three thousand, one hundred five".