21120833 has 2 divisors, whose sum is σ = 21120834. Its totient is φ = 21120832.

The previous prime is 21120829. The next prime is 21120893. The reversal of 21120833 is 33802112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14531344 + 6589489 = 3812^2 + 2567^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120833 - 2² = 21120829 is a prime.

It is a super-2 number, since 2×21120833² = 892179173227778, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21120893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560416 + 10560417.

It is an arithmetic number, because the mean of its divisors is an integer number (10560417).

Almost surely, 2^21120833 is an apocalyptic number.

It is an amenable number.

21120833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120833 is an equidigital number, since it uses as much as digits as its factorization.

21120833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21120833 is about 4595.7407455164. The cubic root of 21120833 is about 276.4205632326.

Adding to 21120833 its reverse (33802112), we get a palindrome (54922945).

The spelling of 21120833 in words is "twenty-one million, one hundred twenty thousand, eight hundred thirty-three".