10221200686721 has 2 divisors, whose sum is σ = 10221200686722. Its totient is φ = 10221200686720.

The previous prime is 10221200686709. The next prime is 10221200686751. The reversal of 10221200686721 is 12768600212201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6131244538225 + 4089956148496 = 2476135^2 + 2022364^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221200686721 - 2⁶ = 10221200686657 is a prime.

It is not a weakly prime, because it can be changed into another prime (10221200686751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110600343360 + 5110600343361.

It is an arithmetic number, because the mean of its divisors is an integer number (5110600343361).

Almost surely, 2^{10221200686721} is an apocalyptic number.

It is an amenable number.

10221200686721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221200686721 is an equidigital number, since it uses as much as digits as its factorization.

10221200686721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

Adding to 10221200686721 its reverse (12768600212201), we get a palindrome (22989800898922).

The spelling of 10221200686721 in words is "ten trillion, two hundred twenty-one billion, two hundred million, six hundred eighty-six thousand, seven hundred twenty-one".