21404110 has 64 divisors (see below), whose sum is σ = 48609792. Its totient is φ = 6604416.

The previous prime is 21404101. The next prime is 21404147. The reversal of 21404110 is 1140412.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38857 + ... + 39403.

It is an arithmetic number, because the mean of its divisors is an integer number (759528).

Almost surely, 2^21404110 is an apocalyptic number.

21404110 is an abundant number, since it is smaller than the sum of its proper divisors (27205682).

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

21404110 is a wasteful number, since it uses less digits than its factorization.

21404110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21404110 is about 4626.4576081490. The cubic root of 21404110 is about 277.6508824253.

Adding to 21404110 its reverse (1140412), we get a palindrome (22544522).

The spelling of 21404110 in words is "twenty-one million, four hundred four thousand, one hundred ten".