21104010 has 32 divisors (see below), whose sum is σ = 56278080. Its totient is φ = 5627664.

The previous prime is 21103961. The next prime is 21104011. The reversal of 21104010 is 1040112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21103983 and 21104001.

It is not an unprimeable number, because it can be changed into a prime (21104011) 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, 38812 + ... + 39351.

It is an arithmetic number, because the mean of its divisors is an integer number (1758690).

Almost surely, 2^21104010 is an apocalyptic number.

21104010 is an abundant number, since it is smaller than the sum of its proper divisors (35174070).

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

21104010 is a wasteful number, since it uses less digits than its factorization.

21104010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78179 (or 78173 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 21104010 is about 4593.9100992510. The cubic root of 21104010 is about 276.3471529598.

Adding to 21104010 its reverse (1040112), we get a palindrome (22144122).

The spelling of 21104010 in words is "twenty-one million, one hundred four thousand, ten".