2101643801 has 2 divisors, whose sum is σ = 2101643802. Its totient is φ = 2101643800.

The previous prime is 2101643773. The next prime is 2101643839. The reversal of 2101643801 is 1083461012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1491504400 + 610139401 = 38620^2 + 24701^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101643801 - 2¹⁸ = 2101381657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2101643701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050821900 + 1050821901.

It is an arithmetic number, because the mean of its divisors is an integer number (1050821901).

Almost surely, 2^2101643801 is an apocalyptic number.

It is an amenable number.

2101643801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101643801 is an equidigital number, since it uses as much as digits as its factorization.

2101643801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2101643801 is about 45843.6887804636. The cubic root of 2101643801 is about 1280.9132075761.

The spelling of 2101643801 in words is "two billion, one hundred one million, six hundred forty-three thousand, eight hundred one".