21410465 has 4 divisors (see below), whose sum is σ = 25692564. Its totient is φ = 17128368.

The previous prime is 21410437. The next prime is 21410471. The reversal of 21410465 is 56401412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 5121169 = 4036^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 21410465 - 2¹⁴ = 21394081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21410465.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2141042 + ... + 2141051.

It is an arithmetic number, because the mean of its divisors is an integer number (6423141).

Almost surely, 2^21410465 is an apocalyptic number.

It is an amenable number.

21410465 is a deficient number, since it is larger than the sum of its proper divisors (4282099).

21410465 is an equidigital number, since it uses as much as digits as its factorization.

21410465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4282098.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21410465 is about 4627.1443677499. The cubic root of 21410465 is about 277.6783584063.

Adding to 21410465 its reverse (56401412), we get a palindrome (77811877).

The spelling of 21410465 in words is "twenty-one million, four hundred ten thousand, four hundred sixty-five".