21133834 has 4 divisors (see below), whose sum is σ = 31700754. Its totient is φ = 10566916.

The previous prime is 21133831. The next prime is 21133841. The reversal of 21133834 is 43833112.

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., 16524225 + 4609609 = 4065^2 + 2147^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21133799 and 21133808.

It is not an unprimeable number, because it can be changed into a prime (21133831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283457 + ... + 5283460.

Almost surely, 2^21133834 is an apocalyptic number.

21133834 is a deficient number, since it is larger than the sum of its proper divisors (10566920).

21133834 is a wasteful number, since it uses less digits than its factorization.

21133834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10566919.

The product of its digits is 1728, while the sum is 25.

The square root of 21133834 is about 4597.1549897736. The cubic root of 21133834 is about 276.4772688024.

Adding to 21133834 its reverse (43833112), we get a palindrome (64966946).

The spelling of 21133834 in words is "twenty-one million, one hundred thirty-three thousand, eight hundred thirty-four".