21133324811 has 2 divisors, whose sum is σ = 21133324812. Its totient is φ = 21133324810.

The previous prime is 21133324799. The next prime is 21133324819. The reversal of 21133324811 is 11842333112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21133324811 - 2²² = 21129130507 is a prime.

It is a super-3 number, since 3×21133324811³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21133324819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566662405 + 10566662406.

It is an arithmetic number, because the mean of its divisors is an integer number (10566662406).

Almost surely, 2^21133324811 is an apocalyptic number.

21133324811 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133324811 is an equidigital number, since it uses as much as digits as its factorization.

21133324811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

Adding to 21133324811 its reverse (11842333112), we get a palindrome (32975657923).

The spelling of 21133324811 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-four thousand, eight hundred eleven".