21105410 has 16 divisors (see below), whose sum is σ = 38282112. Its totient is φ = 8377200.

The previous prime is 21105407. The next prime is 21105419. The reversal of 21105410 is 1450112.

It is a super-3 number, since 3×21105410³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21105419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6746 + ... + 9365.

It is an arithmetic number, because the mean of its divisors is an integer number (2392632).

Almost surely, 2^21105410 is an apocalyptic number.

21105410 is a deficient number, since it is larger than the sum of its proper divisors (17176702).

21105410 is a wasteful number, since it uses less digits than its factorization.

21105410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16249.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21105410 is about 4594.0624723658. The cubic root of 21105410 is about 276.3532636067.

Adding to 21105410 its reverse (1450112), we get a palindrome (22555522).

The spelling of 21105410 in words is "twenty-one million, one hundred five thousand, four hundred ten".