21161103 has 8 divisors (see below), whose sum is σ = 28270848. Its totient is φ = 14079384.

The previous prime is 21161089. The next prime is 21161113. The reversal of 21161103 is 30116112.

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

It is not a de Polignac number, because 21161103 - 2⁹ = 21160591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161113) 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, 5175 + ... + 8312.

It is an arithmetic number, because the mean of its divisors is an integer number (3533856).

Almost surely, 2^21161103 is an apocalyptic number.

21161103 is a deficient number, since it is larger than the sum of its proper divisors (7109745).

21161103 is a wasteful number, since it uses less digits than its factorization.

21161103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14013.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 21161103 is about 4600.1198897420. The cubic root of 21161103 is about 276.5961306289.

Adding to 21161103 its reverse (30116112), we get a palindrome (51277215).

The spelling of 21161103 in words is "twenty-one million, one hundred sixty-one thousand, one hundred three".