21061103 has 16 divisors (see below), whose sum is σ = 24897600. Its totient is φ = 17438976.

The previous prime is 21061097. The next prime is 21061109. The reversal of 21061103 is 30116012.

It is an interprime number because it is at equal distance from previous prime (21061097) and next prime (21061109).

It is a cyclic number.

It is not a de Polignac number, because 21061103 - 2¹⁰ = 21060079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60173 + ... + 60521.

It is an arithmetic number, because the mean of its divisors is an integer number (1556100).

Almost surely, 2^21061103 is an apocalyptic number.

21061103 is a deficient number, since it is larger than the sum of its proper divisors (3836497).

21061103 is a wasteful number, since it uses less digits than its factorization.

21061103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21061103 is about 4589.2377362695. The cubic root of 21061103 is about 276.1597435195.

Adding to 21061103 its reverse (30116012), we get a palindrome (51177115).

The spelling of 21061103 in words is "twenty-one million, sixty-one thousand, one hundred three".