21106410 has 96 divisors (see below), whose sum is σ = 57552768. Its totient is φ = 4942080.

The previous prime is 21106399. The next prime is 21106411. The reversal of 21106410 is 1460112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21106410.

It is not an unprimeable number, because it can be changed into a prime (21106411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116520 + ... + 116700.

It is an arithmetic number, because the mean of its divisors is an integer number (599508).

Almost surely, 2^21106410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21106410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28776384).

21106410 is an abundant number, since it is smaller than the sum of its proper divisors (36446358).

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

21106410 is a wasteful number, since it uses less digits than its factorization.

21106410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 227 counting only the distinct ones).

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

The square root of 21106410 is about 4594.1713072109. The cubic root of 21106410 is about 276.3576281890.

Adding to 21106410 its reverse (1460112), we get a palindrome (22566522).

The spelling of 21106410 in words is "twenty-one million, one hundred six thousand, four hundred ten".