21321197333 has 2 divisors, whose sum is σ = 21321197334. Its totient is φ = 21321197332.

The previous prime is 21321197297. The next prime is 21321197341. The reversal of 21321197333 is 33379112312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18112314724 + 3208882609 = 134582^2 + 56647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321197333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321197293 and 21321197302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321196333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660598666 + 10660598667.

It is an arithmetic number, because the mean of its divisors is an integer number (10660598667).

Almost surely, 2^21321197333 is an apocalyptic number.

It is an amenable number.

21321197333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321197333 is an equidigital number, since it uses as much as digits as its factorization.

21321197333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 35.

The spelling of 21321197333 in words is "twenty-one billion, three hundred twenty-one million, one hundred ninety-seven thousand, three hundred thirty-three".