21311410 has 8 divisors (see below), whose sum is σ = 38360556. Its totient is φ = 8524560.

The previous prime is 21311399. The next prime is 21311413. The reversal of 21311410 is 1411312.

It can be written as a sum of positive squares in 2 ways, for example, as 18224361 + 3087049 = 4269^2 + 1757^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21311413) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1065561 + ... + 1065580.

Almost surely, 2^21311410 is an apocalyptic number.

21311410 is a deficient number, since it is larger than the sum of its proper divisors (17049146).

21311410 is a wasteful number, since it uses less digits than its factorization.

21311410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131148.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21311410 is about 4616.4282730267. The cubic root of 21311410 is about 277.2494722379.

Adding to 21311410 its reverse (1411312), we get a palindrome (22722722).

The spelling of 21311410 in words is "twenty-one million, three hundred eleven thousand, four hundred ten".