21134411 has 4 divisors (see below), whose sum is σ = 21168024. Its totient is φ = 21100800.

The previous prime is 21134389. The next prime is 21134419. The reversal of 21134411 is 11443112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21134411 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 21134411.

It is not an unprimeable number, because it can be changed into a prime (21134419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15845 + ... + 17126.

It is an arithmetic number, because the mean of its divisors is an integer number (5292006).

Almost surely, 2^21134411 is an apocalyptic number.

21134411 is a deficient number, since it is larger than the sum of its proper divisors (33613).

21134411 is an equidigital number, since it uses as much as digits as its factorization.

21134411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33612.

The product of its digits is 96, while the sum is 17.

The square root of 21134411 is about 4597.2177455500. The cubic root of 21134411 is about 276.4797849247.

Adding to 21134411 its reverse (11443112), we get a palindrome (32577523).

The spelling of 21134411 in words is "twenty-one million, one hundred thirty-four thousand, four hundred eleven".