21533066 has 8 divisors (see below), whose sum is σ = 32320704. Its totient is φ = 10759500.

The previous prime is 21533047. The next prime is 21533111. The reversal of 21533066 is 66033512.

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

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, 2111 + ... + 6893.

It is an arithmetic number, because the mean of its divisors is an integer number (4040088).

Almost surely, 2^21533066 is an apocalyptic number.

21533066 is a deficient number, since it is larger than the sum of its proper divisors (10787638).

21533066 is a wasteful number, since it uses less digits than its factorization.

21533066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 21533066 is about 4640.3734763486. The cubic root of 21533066 is about 278.2073655982.

Adding to 21533066 its reverse (66033512), we get a palindrome (87566578).

The spelling of 21533066 in words is "twenty-one million, five hundred thirty-three thousand, sixty-six".