21017433 has 8 divisors (see below), whose sum is σ = 28202368. Its totient is φ = 13922064.

The previous prime is 21017419. The next prime is 21017453. The reversal of 21017433 is 33471012.

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

It is not a de Polignac number, because 21017433 - 2¹⁰ = 21016409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21017453) 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 in 7 ways as a sum of consecutive naturals, for example, 21841 + ... + 22782.

It is an arithmetic number, because the mean of its divisors is an integer number (3525296).

Almost surely, 2^21017433 is an apocalyptic number.

It is an amenable number.

21017433 is a deficient number, since it is larger than the sum of its proper divisors (7184935).

21017433 is a wasteful number, since it uses less digits than its factorization.

21017433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44783.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21017433 is about 4584.4773966069. The cubic root of 21017433 is about 275.9687398958.

Adding to 21017433 its reverse (33471012), we get a palindrome (54488445).

The spelling of 21017433 in words is "twenty-one million, seventeen thousand, four hundred thirty-three".