21416834 has 4 divisors (see below), whose sum is σ = 32125254. Its totient is φ = 10708416.

The previous prime is 21416833. The next prime is 21416839. The reversal of 21416834 is 43861412.

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

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 5536609 = 3985^2 + 2353^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21416797 and 21416806.

It is not an unprimeable number, because it can be changed into a prime (21416833) 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 as a sum of consecutive naturals, namely, 5354207 + ... + 5354210.

Almost surely, 2^21416834 is an apocalyptic number.

21416834 is a deficient number, since it is larger than the sum of its proper divisors (10708420).

21416834 is a wasteful number, since it uses less digits than its factorization.

21416834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10708419.

The product of its digits is 4608, while the sum is 29.

The square root of 21416834 is about 4627.8325380247. The cubic root of 21416834 is about 277.7058894622.

The spelling of 21416834 in words is "twenty-one million, four hundred sixteen thousand, eight hundred thirty-four".