2101321801 has 2 divisors, whose sum is σ = 2101321802. Its totient is φ = 2101321800.

The previous prime is 2101321799. The next prime is 2101321823. The reversal of 2101321801 is 1081231012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1635798025 + 465523776 = 40445^2 + 21576^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101321801 - 2¹ = 2101321799 is a prime.

It is a super-2 number, since 2×2101321801² = 8831106622715767202, which contains 22 as substring.

Together with 2101321799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2101321841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050660900 + 1050660901.

It is an arithmetic number, because the mean of its divisors is an integer number (1050660901).

Almost surely, 2^2101321801 is an apocalyptic number.

It is an amenable number.

2101321801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101321801 is an equidigital number, since it uses as much as digits as its factorization.

2101321801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 2101321801 is about 45840.1767121376. The cubic root of 2101321801 is about 1280.8477865440.

Adding to 2101321801 its reverse (1081231012), we get a palindrome (3182552813).

The spelling of 2101321801 in words is "two billion, one hundred one million, three hundred twenty-one thousand, eight hundred one".