20210101001 has 2 divisors, whose sum is σ = 20210101002. Its totient is φ = 20210101000.

The previous prime is 20210100997. The next prime is 20210101031. The reversal of 20210101001 is 10010101202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19667257600 + 542843401 = 140240^2 + 23299^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210101001 - 2² = 20210100997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210101001.

It is not a weakly prime, because it can be changed into another prime (20210101031) 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, 10105050500 + 10105050501.

It is an arithmetic number, because the mean of its divisors is an integer number (10105050501).

Almost surely, 2^20210101001 is an apocalyptic number.

It is an amenable number.

20210101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210101001 is an equidigital number, since it uses as much as digits as its factorization.

20210101001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20210101001 its reverse (10010101202), we get a palindrome (30220202203).

The spelling of 20210101001 in words is "twenty billion, two hundred ten million, one hundred one thousand, one".