21680103 has 8 divisors (see below), whose sum is σ = 29612016. Its totient is φ = 14100800.

The previous prime is 21680101. The next prime is 21680143. The reversal of 21680103 is 30108612.

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 21680103 - 2¹ = 21680101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21680103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21680101) 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, 88008 + ... + 88253.

It is an arithmetic number, because the mean of its divisors is an integer number (3701502).

Almost surely, 2^21680103 is an apocalyptic number.

21680103 is a deficient number, since it is larger than the sum of its proper divisors (7931913).

21680103 is a wasteful number, since it uses less digits than its factorization.

21680103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176305.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21680103 is about 4656.1897512881. The cubic root of 21680103 is about 278.8391693919.

Adding to 21680103 its reverse (30108612), we get a palindrome (51788715).

The spelling of 21680103 in words is "twenty-one million, six hundred eighty thousand, one hundred three".