21204033 has 8 divisors (see below), whose sum is σ = 28476000. Its totient is φ = 14034048.

The previous prime is 21204013. The next prime is 21204037. The reversal of 21204033 is 33040212.

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

It is not a de Polignac number, because 21204033 - 2¹³ = 21195841 is a prime.

It is a super-2 number, since 2×21204033² = 899222030930178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21204037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25008 + ... + 25841.

It is an arithmetic number, because the mean of its divisors is an integer number (3559500).

Almost surely, 2^21204033 is an apocalyptic number.

It is an amenable number.

21204033 is a deficient number, since it is larger than the sum of its proper divisors (7271967).

21204033 is a wasteful number, since it uses less digits than its factorization.

21204033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50991.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21204033 is about 4604.7837082756. The cubic root of 21204033 is about 276.7830498561.

Adding to 21204033 its reverse (33040212), we get a palindrome (54244245).

The spelling of 21204033 in words is "twenty-one million, two hundred four thousand, thirty-three".