9221143721 has 2 divisors, whose sum is σ = 9221143722. Its totient is φ = 9221143720.

The previous prime is 9221143703. The next prime is 9221143747. The reversal of 9221143721 is 1273411229.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8790000025 + 431143696 = 93755^2 + 20764^2 .

It is a cyclic number.

It is not a de Polignac number, because 9221143721 - 2¹⁸ = 9220881577 is a prime.

It is not a weakly prime, because it can be changed into another prime (9221133721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4610571860 + 4610571861.

It is an arithmetic number, because the mean of its divisors is an integer number (4610571861).

Almost surely, 2^9221143721 is an apocalyptic number.

It is an amenable number.

9221143721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9221143721 is an equidigital number, since it uses as much as digits as its factorization.

9221143721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 9221143721 is about 96026.7864764827. The cubic root of 9221143721 is about 2096.9830996088.

The spelling of 9221143721 in words is "nine billion, two hundred twenty-one million, one hundred forty-three thousand, seven hundred twenty-one".