21054933 has 12 divisors (see below), whose sum is σ = 30454060. Its totient is φ = 14017536.

The previous prime is 21054923. The next prime is 21054941. The reversal of 21054933 is 33945012.

It can be written as a sum of positive squares in 2 ways, for example, as 19421649 + 1633284 = 4407^2 + 1278^2 .

It is not a de Polignac number, because 21054933 - 2⁹ = 21054421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21054897 and 21054906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054923) 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, 9363 + ... + 11391.

Almost surely, 2^21054933 is an apocalyptic number.

It is an amenable number.

21054933 is a deficient number, since it is larger than the sum of its proper divisors (9399127).

21054933 is a wasteful number, since it uses less digits than its factorization.

21054933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3188 (or 3185 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 21054933 is about 4588.5654621025. The cubic root of 21054933 is about 276.1327732316.

Adding to 21054933 its reverse (33945012), we get a palindrome (54999945).

The spelling of 21054933 in words is "twenty-one million, fifty-four thousand, nine hundred thirty-three".