21103404 has 24 divisors (see below), whose sum is σ = 56275968. Its totient is φ = 6029520.

The previous prime is 21103403. The next prime is 21103441. The reversal of 21103404 is 40430112.

It is not an unprimeable number, because it can be changed into a prime (21103403) 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, 125532 + ... + 125699.

It is an arithmetic number, because the mean of its divisors is an integer number (2344832).

Almost surely, 2^21103404 is an apocalyptic number.

It is an amenable number.

21103404 is an abundant number, since it is smaller than the sum of its proper divisors (35172564).

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

21103404 is a wasteful number, since it uses less digits than its factorization.

21103404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251245 (or 251243 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21103404 is about 4593.8441418925. The cubic root of 21103404 is about 276.3445078388.

Adding to 21103404 its reverse (40430112), we get a palindrome (61533516).

The spelling of 21103404 in words is "twenty-one million, one hundred three thousand, four hundred four".