21104106 has 32 divisors (see below), whose sum is σ = 45111168. Its totient is φ = 6558720.

The previous prime is 21104071. The next prime is 21104131. The reversal of 21104106 is 60140112.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10611 + ... + 12441.

It is an arithmetic number, because the mean of its divisors is an integer number (1409724).

Almost surely, 2^21104106 is an apocalyptic number.

21104106 is an abundant number, since it is smaller than the sum of its proper divisors (24007062).

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

21104106 is a wasteful number, since it uses less digits than its factorization.

21104106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21104106 is about 4593.9205478545. The cubic root of 21104106 is about 276.3475719842.

Adding to 21104106 its reverse (60140112), we get a palindrome (81244218).

It can be divided in two parts, 2110 and 4106, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 21104106 in words is "twenty-one million, one hundred four thousand, one hundred six".