21031322293 has 2 divisors, whose sum is σ = 21031322294. Its totient is φ = 21031322292.

The previous prime is 21031322287. The next prime is 21031322327. The reversal of 21031322293 is 39222313012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17599471569 + 3431850724 = 132663^2 + 58582^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031322293 - 2¹⁷ = 21031191221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031022293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515661146 + 10515661147.

It is an arithmetic number, because the mean of its divisors is an integer number (10515661147).

Almost surely, 2^21031322293 is an apocalyptic number.

It is an amenable number.

21031322293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031322293 is an equidigital number, since it uses as much as digits as its factorization.

21031322293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21031322293 in words is "twenty-one billion, thirty-one million, three hundred twenty-two thousand, two hundred ninety-three".