21103116 has 24 divisors (see below), whose sum is σ = 50171184. Its totient is φ = 6901440.

The previous prime is 21103109. The next prime is 21103123. The reversal of 21103116 is 61130112.

It is an interprime number because it is at equal distance from previous prime (21103109) and next prime (21103123).

It is a junction number, because it is equal to n+sod(n) for n = 21103095 and 21103104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15955 + ... + 17226.

It is an arithmetic number, because the mean of its divisors is an integer number (2090466).

Almost surely, 2^21103116 is an apocalyptic number.

It is an amenable number.

21103116 is an abundant number, since it is smaller than the sum of its proper divisors (29068068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103116 is a wasteful number, since it uses less digits than its factorization.

21103116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33241 (or 33239 counting only the distinct ones).

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

The square root of 21103116 is about 4593.8127954892. The cubic root of 21103116 is about 276.3432507339.

Adding to 21103116 its reverse (61130112), we get a palindrome (82233228).

The spelling of 21103116 in words is "twenty-one million, one hundred three thousand, one hundred sixteen".