21447333 has 12 divisors (see below), whose sum is σ = 32610240. Its totient is φ = 13545576.

The previous prime is 21447311. The next prime is 21447337. The reversal of 21447333 is 33374412.

It is not a de Polignac number, because 21447333 - 2⁵ = 21447301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21447297 and 21447306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447337) 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 11 ways as a sum of consecutive naturals, for example, 62541 + ... + 62882.

It is an arithmetic number, because the mean of its divisors is an integer number (2717520).

Almost surely, 2^21447333 is an apocalyptic number.

It is an amenable number.

21447333 is a deficient number, since it is larger than the sum of its proper divisors (11162907).

21447333 is a wasteful number, since it uses less digits than its factorization.

21447333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125448 (or 125445 counting only the distinct ones).

The product of its digits is 6048, while the sum is 27.

The square root of 21447333 is about 4631.1265368159. The cubic root of 21447333 is about 277.8376508390.

The spelling of 21447333 in words is "twenty-one million, four hundred forty-seven thousand, three hundred thirty-three".