100023001721 has 2 divisors, whose sum is σ = 100023001722. Its totient is φ = 100023001720.

The previous prime is 100023001699. The next prime is 100023001831. The reversal of 100023001721 is 127100320001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99903405625 + 119596096 = 316075^2 + 10936^2 .

It is an emirp because it is prime and its reverse (127100320001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100023001721 - 2²² = 100018807417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100023001721.

It is not a weakly prime, because it can be changed into another prime (100083001721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50011500860 + 50011500861.

It is an arithmetic number, because the mean of its divisors is an integer number (50011500861).

Almost surely, 2^100023001721 is an apocalyptic number.

It is an amenable number.

100023001721 is a deficient number, since it is larger than the sum of its proper divisors (1).

100023001721 is an equidigital number, since it uses as much as digits as its factorization.

100023001721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

Adding to 100023001721 its reverse (127100320001), we get a palindrome (227123321722).

The spelling of 100023001721 in words is "one hundred billion, twenty-three million, one thousand, seven hundred twenty-one".