21266103 has 8 divisors (see below), whose sum is σ = 28377216. Its totient is φ = 14166200.

The previous prime is 21266087. The next prime is 21266117. The reversal of 21266103 is 30166212.

It is a happy number.

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 21266103 - 2⁴ = 21266087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21266103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266173) 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, 3958 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (3547152).

Almost surely, 2^21266103 is an apocalyptic number.

21266103 is a deficient number, since it is larger than the sum of its proper divisors (7111113).

21266103 is a wasteful number, since it uses less digits than its factorization.

21266103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21266103 is about 4611.5185134617. The cubic root of 21266103 is about 277.0528599699.

The spelling of 21266103 in words is "twenty-one million, two hundred sixty-six thousand, one hundred three".