20833121 has 2 divisors, whose sum is σ = 20833122. Its totient is φ = 20833120.

The previous prime is 20833103. The next prime is 20833133. The reversal of 20833121 is 12133802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 3025 = 4564^2 + 55^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20833121 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20833093 and 20833102.

It is not a weakly prime, because it can be changed into another prime (20836121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10416560 + 10416561.

It is an arithmetic number, because the mean of its divisors is an integer number (10416561).

Almost surely, 2^20833121 is an apocalyptic number.

It is an amenable number.

20833121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20833121 is an equidigital number, since it uses as much as digits as its factorization.

20833121 is an evil number, because the sum of its binary digits is even.

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

The square root of 20833121 is about 4564.3313858658. The cubic root of 20833121 is about 275.1596692591.

Adding to 20833121 its reverse (12133802), we get a palindrome (32966923).

The spelling of 20833121 in words is "twenty million, eight hundred thirty-three thousand, one hundred twenty-one".