21850103 has 4 divisors (see below), whose sum is σ = 23836488. Its totient is φ = 19863720.

The previous prime is 21850099. The next prime is 21850177. The reversal of 21850103 is 30105812.

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

It is a cyclic number.

It is not a de Polignac number, because 21850103 - 2² = 21850099 is a prime.

It is a super-2 number, since 2×21850103² = 954854002221218, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993176 + ... + 993197.

It is an arithmetic number, because the mean of its divisors is an integer number (5959122).

Almost surely, 2^21850103 is an apocalyptic number.

21850103 is a deficient number, since it is larger than the sum of its proper divisors (1986385).

21850103 is a wasteful number, since it uses less digits than its factorization.

21850103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986384.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21850103 is about 4674.4093744558. The cubic root of 21850103 is about 279.5660923895.

Adding to 21850103 its reverse (30105812), we get a palindrome (51955915).

The spelling of 21850103 in words is "twenty-one million, eight hundred fifty thousand, one hundred three".