21221032193 has 2 divisors, whose sum is σ = 21221032194. Its totient is φ = 21221032192.

The previous prime is 21221032171. The next prime is 21221032229. The reversal of 21221032193 is 39123012212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14163856144 + 7057176049 = 119012^2 + 84007^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221032193 - 2³⁰ = 20147290369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21221032993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610516096 + 10610516097.

It is an arithmetic number, because the mean of its divisors is an integer number (10610516097).

Almost surely, 2^21221032193 is an apocalyptic number.

It is an amenable number.

21221032193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221032193 is an equidigital number, since it uses as much as digits as its factorization.

21221032193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21221032193 in words is "twenty-one billion, two hundred twenty-one million, thirty-two thousand, one hundred ninety-three".