21054833 has 8 divisors (see below), whose sum is σ = 21520296. Its totient is φ = 20592000.

The previous prime is 21054827. The next prime is 21054851. The reversal of 21054833 is 33845012.

It can be written as a sum of positive squares in 4 ways, for example, as 11916304 + 9138529 = 3452^2 + 3023^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21054833 - 2¹² = 21050737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21054863) 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, 31523 + ... + 32183.

It is an arithmetic number, because the mean of its divisors is an integer number (2690037).

Almost surely, 2^21054833 is an apocalyptic number.

It is an amenable number.

21054833 is a deficient number, since it is larger than the sum of its proper divisors (465463).

21054833 is an equidigital number, since it uses as much as digits as its factorization.

21054833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21054833 is about 4588.5545654378. The cubic root of 21054833 is about 276.1323360685.

Adding to 21054833 its reverse (33845012), we get a palindrome (54899845).

The spelling of 21054833 in words is "twenty-one million, fifty-four thousand, eight hundred thirty-three".