100222071721 has 2 divisors, whose sum is σ = 100222071722. Its totient is φ = 100222071720.

The previous prime is 100222071713. The next prime is 100222071727. The reversal of 100222071721 is 127170222001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50742518121 + 49479553600 = 225261^2 + 222440^2 .

It is a cyclic number.

It is not a de Polignac number, because 100222071721 - 2³ = 100222071713 is a prime.

It is not a weakly prime, because it can be changed into another prime (100222071727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50111035860 + 50111035861.

It is an arithmetic number, because the mean of its divisors is an integer number (50111035861).

Almost surely, 2^100222071721 is an apocalyptic number.

It is an amenable number.

100222071721 is a deficient number, since it is larger than the sum of its proper divisors (1).

100222071721 is an equidigital number, since it uses as much as digits as its factorization.

100222071721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 25.

Adding to 100222071721 its reverse (127170222001), we get a palindrome (227392293722).

The spelling of 100222071721 in words is "one hundred billion, two hundred twenty-two million, seventy-one thousand, seven hundred twenty-one".