21791103 has 8 divisors (see below), whose sum is σ = 29079216. Its totient is φ = 14515200.

The previous prime is 21791087. The next prime is 21791117. The reversal of 21791103 is 30119712.

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

It is not a de Polignac number, because 21791103 - 2⁴ = 21791087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21791173) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2623 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (3634902).

Almost surely, 2^21791103 is an apocalyptic number.

21791103 is a deficient number, since it is larger than the sum of its proper divisors (7288113).

21791103 is a wasteful number, since it uses less digits than its factorization.

21791103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 21791103 is about 4668.0941507215. The cubic root of 21791103 is about 279.3142359427.

The spelling of 21791103 in words is "twenty-one million, seven hundred ninety-one thousand, one hundred three".