21334534 has 8 divisors (see below), whose sum is σ = 34463520. Its totient is φ = 9846696.

The previous prime is 21334499. The next prime is 21334559. The reversal of 21334534 is 43543312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21334499 and 21334508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410254 + ... + 410305.

It is an arithmetic number, because the mean of its divisors is an integer number (4307940).

Almost surely, 2^21334534 is an apocalyptic number.

21334534 is a deficient number, since it is larger than the sum of its proper divisors (13128986).

21334534 is a wasteful number, since it uses less digits than its factorization.

21334534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820574.

The product of its digits is 4320, while the sum is 25.

The square root of 21334534 is about 4618.9321276676. The cubic root of 21334534 is about 277.3497127412.

Adding to 21334534 its reverse (43543312), we get a palindrome (64877846).

The spelling of 21334534 in words is "twenty-one million, three hundred thirty-four thousand, five hundred thirty-four".