4372171721 has 2 divisors, whose sum is σ = 4372171722. Its totient is φ = 4372171720.

The previous prime is 4372171717. The next prime is 4372171777. The reversal of 4372171721 is 1271712734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4256910025 + 115261696 = 65245^2 + 10736^2 .

It is a cyclic number.

It is not a de Polignac number, because 4372171721 - 2² = 4372171717 is a prime.

It is not a weakly prime, because it can be changed into another prime (4372171421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2186085860 + 2186085861.

It is an arithmetic number, because the mean of its divisors is an integer number (2186085861).

Almost surely, 2^4372171721 is an apocalyptic number.

It is an amenable number.

4372171721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4372171721 is an equidigital number, since it uses as much as digits as its factorization.

4372171721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 35.

The square root of 4372171721 is about 66122.3995405490. The cubic root of 4372171721 is about 1635.1806414770.

The spelling of 4372171721 in words is "four billion, three hundred seventy-two million, one hundred seventy-one thousand, seven hundred twenty-one".